How could we set up maybe the menu so that on unplug (yeah, that's right, no silly Safely Remove) the whole menu closes every single app that was running off the flash drive (I think this is one of the few high points of U3)?
I know I've tried it before, without much luck (checking every 10 seconds to see if a file exists isn't exactly good usage of memory). I'll give a prize to whomever can come up with a proof of concept :P.