Good question.
What I'm going to do is to suggest that anyone who's not sure about what components to buy, goes for a cheap, vanilla front wheel or a cheap fixie rear for their first build. I'm thinking I'll post two lists of components, one for each, based round the lovely Rigida Chrina rim, currently only £18 at Spa Cycles. I'll tell you what spoke lengths to get to go with the suggested hubs and then you just need to order the bits.
If you want to build anything else, calculating spoke lengths and so on isn't hard. How's that for an idea?
In deference to Juliet and Marna, I'm not going to say Wednesday 7th May now. Let's call it the day before; Tuesday 6th May.
Sam has offered his office space in Limehouse, so pending further notice, I reckon that's a fab venue. All we have to do now is set up something so people can watch via webcam. Either that, or we'll podcast it afterwards.