HGTV recently aired some shows about this very thing (of course they are ALWAYS airing shows about this).
http://www.hgtv.com/hgtv/shows_hdts
But from our very, and still on going, experience as buyers we can tell you what is important to us while we looked.
1) Move in ready! So many SAY that want a fixer-upper, but the majority still want to be able to move right in. Make sure everything, or nearly everything works.
2) Keep it CLEAN and clutter-free! Quite a few homes we looked at were unbelievably messy. Keep things simple, clean, and most importantly, have it professionally staged!
3) And finally, keep the asking price reasonable. It is far far better to start lower then to start high, and have to lower your price later. Nearly everyone who first looks will NOT come back once a price is reduced.