I've had several people ask for a couple of mods on the forums to allow a signature and for posts to be previewed.
I've added both of these features now, and the signature will remain on the post as it was at the time the post was made, even if you change your sig later. You can also preview your posts before confirming them.
I've also added a new site leaderboard - Gamer by TrueAchievement Difference. This is probably the "purest" measure of your achievement skills - you will get virtually nothing for your 1000 in Avatar here, as it's calculated by subtracting your GamerScore from your TrueAchievement.