My first post was probably on CelticsBlog v. 2.0, which sadly isn't archived. Also, we had a crash here where we lost the vast majority of posts from prior to April 2008, unfortunately.
The earliest one of mine that we have a record of is:
This is going to be our "official" thread. Please post all future Happy Birthday messages in here. Oh, and keep up the good work. Happy birthday to everybody I missed in January and so far in February.
Oh, and don't forget, my birthday is in August. PM me, and I'll give you the address where you can send my gifts.

-Roy
My *actual* first post had something to do with the Antoine Walker trade with Atlanta, I'm pretty sure.