I just got an e-mail from Shelfari with their update announcements. I'm so excited about the addition of a "When I read this" date you can add to each book. If you want to share your books, when you read a book is an important thing to share!
For those who aren't familiar with Shelfari, it's a social networking site for bibliophiles. I believe there are a number of these, Library Thing being a popular one I don't know much about. You can post books you have read, are reading, want to read, give each one "tag" keywords, tag your favorites, rate and review each one, set up groups, make friends, look for people with similar tastes and contact them. It's a lot of fun, though I know all four of my "friends" in real life, so I'm not using the site to its fullest capabilities.
The addition of the date feature may seem very trivial, but it's one I have wanted since I got hooked on this site!