I have modified the shoutbox code that I use on my site (Brett Taylor's Shoutbox). Once I'm sure the modifications are to my liking (and working correctly) :) I will make the modified code available in the download if there is interest. The main reason for the mod's is to prevent name forgeries.The way the block is now functioning is:

• If user is an admin of the site, he can use any name he wishes.
• if user is not an admin but is a registered user, he will always post under his registered name.
• if user is not registered, he will automatically post under a username of Guest-IP.