Stuart's spotted the proposed map for London Transport in 2016. 12 years is a long time away, but it's good to see these proposals floating around; alwaystouchout has the latest plans for London Transport and expected completion dates. Better links around the South East of the capital would be great for me, and there's plenty of that going on.
There's more good tube stuff on Going Underground, and the infamous London Underground Tube Diary.
Ewan (he gets eveywhere) is also going for a Zone 1 Tube Challenge on the 30th June - basically visit every Zone 1 station in the shortest duration - I'm tempted to have a go, but I'm supposed to be karting that evening.
And finally - as they say on the radio - This isn't London. Everything you needed to know about London that the London Open Guide couldn't tell you. Useful stuff like the history of The Worshipful Company of Stanners.