album art works perfect for me , i wrote a guide on how to do it correctlyif youd like it just pm me with your email addy.
The only real usability issues with the Canola 2 beta for me are: Album art and video thumbnailing are impossible to use for an inexperienced user; and even for experienced users the results are sub-optimal IME. No pre-configuration for the known media directories: /media/mmc2/Video, /home/user/MyDocs/{.sounds,.images,.videos} - this means a new user won't see any media found at all, with no explanation. The icons in the green theme are all round, and have no distinct outline making them very hard to distinguish intuitively. The graphite theme gets this right.