Thanks for the answers - didn't mean to open a can o' worms at all - I just like UPX because:

A) I have limited storage space for my files and UPX always saves me a few precious Kb
B) I really don't like flashing.  Just a personal thing.  I've nothing against cracktros/intro text, just the flashing.

To be honest, I didn't used to be fussy - it's the standard of the recent D-Bug cracks/patches with the ace intros and no flashing that made me realise how good cracked games can look...

Anyway, a guide would be great - will probably discuss further via MSN.