I came just across this site called Data Tables and Cascading Style Sheets Gallery, and it fits right in with our recent sessions on styling tables. The site is basically like csszengarden. Chris Heilmann, the owner of the site, posted a table and invited users to submit styles for it. Each example is the same table but with a different style sheet. If you are using Firefox or another browser that lets you turn off styles, you can see the unstyled table.
There are also links to other sites for further information and inspiration on styling tables.
It's a lot of fun and should give us all some good ideas.