Just curious if there was a reason why I don't see any salting of the password hash in Vanilla. MD5 has been around long enough that if you know the MD5 value, you have a good chance of looking up what the password may be.
Also, even if someone managed to get at your cookies, the passwords (md5'd or not) aren't in there. The only way they can get at your password is to (a) query the database directly - which implies that they've already gotten past your db security, or (b) monitor network traffic on your server - which implies that they've already gotten past your server security. If either of those things happened, you've got bigger problems than md5 passwords.
If you ever access the site over an unencrypted wifi connection, or one that has been cracked, an observer could conceivably grab the md5 hash from the HTTP header, find a collision, and log in with that.
In the end though, all he'd get would be your password to a forum he probably doesn't visit anyway.