SarahinTampa has a nice list of tips for getting more out of your Zune 2...

Hack #4: Convert DVD, video, audio, iTunes and YouTube video to Zune or Zune 2 - this hack gives you directions to convert DVD and popular video and audio file formats like AVI, MPEG, DivX, XviD, MOV, ASF, RM to Zune, convert iTunes to Zune, iPod to Zune, M4P to Zune, M4v to Zune, and download and convert video from YouTube, FLV, Google, Myspace, iFilm, etc. to Zune. It was written up for the original Zunes, but sources say it works on Zune 2.

Hack #8: Hack the new Zune 2.0 software to display custom themes - registered members at this forum can download custom themes called zThemes like this Halo 3 one or this Vista one. (Download link here)

To read the other 8, you'll have to head over to sarahintampa or Here.