It's 10 years to the day that GURPS 4th edition came out.
Sean "Dr. Kromm" Punch wrote up a nice little bit for the Daily Illuminator:
GURPS Fourth Turns 10 With . . . Sean Punch
It's pretty good, and as it says, there are 9 more of those to come.
It sure doesn't feel like it's been 10 years that I've been playing GURPS 4th edition. Admittedly, it was a bit longer for me and my group - we got to playtest some of it (such as the rules in GURPS Martial Arts) before it was even released. But still, 10 years? Seems like it just came out.
So, Happy Anniversary, GURPS 4th edition.