Basically, I take my Last.fm data for most played albums of the year, and then filter it to only show albums that were released in 2009.
I then took the resulting RSS feed and headed over to Widgetbox to create a widget that would display it...
UPDATE: Mark Reeder managed to take my idea and make it a lot better. Below is the embed code from his Filterable Charts hack.
My chart looks pretty representative of my taste, even though if asked to provide the list editorially I would probably posture a bit by adding some albums that I think were good (although my actions didn't actually prove it out). The only real exception to my list above is that U2 album... I gave it a bunch of tries to get me on board but ultimately failed (I think it is pretty bad actually).
It would probably be pretty interesting to look at some music bloggers' and critics' charts to see how different their "best of" lists are from their "top played".