I’ve just started using 360voice.com a few weeks ago. So far it’s been very fun to see what my 360 will say each day. Although it’s gotten a little confused (on 3/19 I didn’t really get 48 achievements playing FC Instincts Predator, I just played some games I haven’t played in a while) the posts are very funny.
Have patience setting it up though, it really does take two full days for them to pull all the information. Then, start playing and see what your Xbox has to say!