A couple of guitar-reated notes:

Amplitube Live is a very cool amp simulation app, absolitely worth trying and with an extremely cool GUI (only recently I discovered that it's made by an Italian company... that must be why it's so cool :-). Thanks to Sandro for the hint.

If you like guitars and happen to be in London you can't miss Denmark Street. Thanks to Matt for taking me there (and not letting me walk into any of the shops ;-).