My fellow friendfeeder Hao Chen has created a sweet script for those using greasemonkey that does two things on your twitter page:

one – it adds how many unread @replies messages you have.

two – addes a @mentions tab that when you click on it you get to see any twitter messages that include your username and not just the one’s that start out with @<username> like in the @replies.

I must say its a nice little script to have to enhance the twitter website.

[script - twitter : show # of unread replies + adds mentions]

screenshot of the script in action