You will find all your old messages have your new name a well. It's not a big deal, but some old discussions may be come to be confusing. If somewhere there's a comment like, "As Harryoldham mentioned..." someone trying to identify the reference will have problems.

I must admit that I'm with garg in thinking that the Tech: threads belong below the line, so to speak. It's not a big issue for me, just mentioning it because it came up. They do need the Tech label, though, not BS.