22:00pm As I expected, the viewers are giving it to Darling. A post-debate Guardian/ICM poll puts the Better Together chair ahead by 56 per cent to 44 per cent. That's almost identical to the No campaign's current poll lead.
21:44pm Salmond calls for a vote for "ambition over fear" and says independence would allow Scotland to turn its "prosperous economy into a just society". No one can govern Scotland better than the Scottish people themselves. "This is our moment," he ends, "let's seize it".
21:41pm Closing statements now. Darling warns that "if we vote to leave, there is no going back", adding that Scotland can have "the best of both worlds": a stronger Scottish parliament and the Union. He denounces the "guesswork, blind faith and crossed fingers" of the Yes campaign.
21:37pm The debate moves onto pensions. Darling says that Scotland's rapidly ageing population means it would need higher immigration to sustain the current system.
21:31pm Darling says it is up to the Scottish parliament which services are free and that public spending could remain higher than the UK average. Salmond says Scotland cannot continue to bear "hand-me-down cuts" from Westminster, highlighting the cost of scrapping the bedroom tax.
21:27pm In response to an audience question, Salmond insists that an independent Scotland could maintain free higher education and free prescriptions. But Darling rightly responds that it would become illegal under EU law for the government to deny free university education to non-Scottish students from the rest of the UK.
21:26pm Salmond denounces Darling and his predecessors as Chancellor for failing to set up a sovereign wealth fund for oil.
21:21pm On austerity, Darling says that his 2009 Budget "did more redistribution to people with lower incomes than any other in a generation."
21:14pm Darling says the UK cannot be expected to underwrite a banking system that is 12 times the size of Scotland's GDP. Salmond hits back by noting that Darling was charge of financial regulation "when the banks went bust". He adds that the rest of the UK government would never allow RBS to go under.
21:13pm After repeated criticisms from the audience, Salmond refers them to "page four of our Fiscal Commission report". He'll have to do better than that.
21:08pm Another audience member to Salmond: "You haven't given us a straight answer ... What is your plan B? We need more than 'it'll be alright on the night'".
21:06pm The first question, from a No voter, without a currency union would Scotland use the pound without the permission or is there a contingency plan? Salmond replies that he wants what's best for Scotland, Darling says a monetary union requires a political union and a fiscal union.
21:01pm Before the second half, they've just cut to the spin room again. With his forensic questions on the currency, Darling had the best of that round, with Salmond's attacks rather esoteric by comparison. Audience questions are next.
20:56pm Salmond repeatedly presses Darling on whether he agress with David Cameron that Scotland could be a "successful independent country". Darling replies that he has never said that Scotland couldn't go it alone, but that the risks aren't worth it.
Salmond repeatedly mentions Cameron's name, desperately trying to tie Darling to the Prime Minister who shunned a debate with him.
20:52pm Salmond asks why some of Darling's allies in the No campaign, such as Foreign Secretary Philip Hammond, support EU withdrawal. Darling replies that parties will take different positions on that issue, joking that he and Salmond could find themselves on the same side. The biggest danger for Scotland at present is leaving the UK, he says. Salmond replies that independence is the only way for Scotland to avoid the threat of EU withdrawal.
20:50pm Darling ridicules Salmond's belief that Scotland would easily win EU membership: "The one thing you can't accuse the EU of is moving at speed".
20:48pm It's Salmond's turn now. He asks Darling why the No campaign refers to itself as "Project Fear". It doesn't, replies Darling.
20:45pm The debate moves onto public spending. "We have to end austerity," says Salmond. When Darling replies by pointing to the large deficit Scotland would face, Salmond responds by reminding him that the UK's deficit reached 11 per cent when Darling was Chancellor.
20:42pm Darling: "So plan B is to scrabble around using somebody else's currency. That's not independence, that's foolishness of the first order." Salmond replies by referring to the report in the Guardian earlier this year that a senior UK minister believes Scotland would be offered a currency union if it voted for independence.
20:39pm Darling runs through the alternative options: would Scotland adopt the euro (which, as he notes, Salmond used to favour)? Would it create a new currency? Salmond says Scotland will keep the pound as that's "best for Scotland and for the rest of the UK".
Darling responds: "but you won't have a central bank ... you can't seriously be saying this. Scotland can't uses somebody else's currency."
20:36pm Boos from the audience as Salmond refuses to answer Darling's repeated question: "what is your plan B?"
20:33pm Darling rightly points out that Salmond's stance would leave Scotland with no lender of last resort (the Bank of England at present).
20:32pm After an ad break, the debate is back. Darling and Salmond now have 12 minutes each to cross-examine their opponent.
Darling starts by challenging Salmond over the currency: what's his plan B if he doesn't get a monetary union? Salmond says an independent Scotland would continue to use the pound without permission (rather like Panama uses the dollar).
20:25pm After much searching, I've managed to find a working stream at http://zattoo.com/watch/stv
Highlights to folow. They've just cut to the "spin room".
20:06pm The demand for the debate appears to overwhelmed the STV player, which immediately crashed at 8pm. I'm trying to find somewhere else to listen to it, but for now this only further proves why it should have been televised.
19:47pm After months of waiting, Alistair Darling and Alex Salmond are finally going head-to-head in debate. The encounter isn't being televised outside of Scotland, but non-Scottish viewers can watch it live on the STV player. I'll be live blogging the highlights from 8pm.