Actually I've just been thinking that a clean install might solve some of the (very) minor irritations I have with Lion - whose interface I love far more than Snow Leopard's.
I have a 2010 Air and if you have the same, perhaps you can advise on the following:
1. Will my Ilife 2011 on the 2010 Air USB drive install on Lion?
2. Should I restore from my current Time Machine backup or genuinely start from scratch?
I'm sure there'll be a guide to doing it somewhere out there, but if any of you have done it recently, would appreciate any advice.