I know we have the Friend ID thread but I personally find it quite a hassle to browse through 30 pages to find that one certain member/ID.
When I want to clean up my friendlist to add some forumers I don't want to accidently delete some old forumers I forgot about.
That's why I made the following list:
It is still very much incomplete, but it is a start. If you're not in it let me know your ID and I'll add you.