iTunes Question

Ok, so I came by an iPod the other day and am starting to fill it up, and am finding iTunes horrible, slow and cumbersome.  But complaints aside--is there some way that I could find out exactly which mp3's from my library are on my iPod at the moment?  In a move of incredible stupidity, I imported some folders that had multiple copies of many of my mp3's (all id3'd identically! ><) so now my library is bloated with dupes.

I'd really prefer not to just delete at random, since that would cause sync problems if the copy I deleted happened to be the copy on my iPod and I'd have to redo hours of work picking and choosing music again...is there any reasonable way to do this, or am I fucked?

Oh and if you have synced your iPod with iTunes, I'm pretty sure it copies over everything, so just check your iTunes playlist or whatever. iTunes blows big chunks, so if you dislike it, and are using a non-color screen iPod, go grab ml_iPod for Winamp, and be free from the shit that is iTunes.