Want to filter your music by Album, Artist, or Genre?
Simply option-click (sorry, I don't know the PC version, probably Ctrl-Click?) on the little arrows that show up next to the item you'd like to filter, and voila. Filter complete.
I recently found out about iConcertCal, a super cool plug-in for iTunes. According to their website, "iConcertCal is a free iTunes plug-in that monitors your music library and generates a personalized calendar of upcoming concerts in your city."
I haven't installed it yet, but definitely plan to. I will try to remember to give a recap about how accurate/useful it is after a few weeks of use.