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?

>>10
One of the features I'd like is a more comprehensive/intuitive ID3 tagging mechanism within iTunes.  As is, I usually use a better, faster program to tag my mp3's, THEN import them into iTunes.  A pain, to be sure, but it STILL saves time and aggravation, ironically enough.