Check out this new article from the Daily Illuminator that Steve Jackson Games posted:

July 21, 2008: Penny Candy for Your Character!

It's catchy, but true: Perks are flavorful little bonuses for any character. Sure, they don't affect your rolls very much, but they only cost one point.</p>

And now Sean "Dr. Kromm" Punch has gathered all the Perks from every published GURPS Fourth Edition release -- including combat perks from GURPS Martial Arts -- into one handy reference: GURPS Power-Ups 2: Perks. Already own the complete Fourth Edition line? Sean's got something for you, too! Actually, a couple dozen somethings, in the form of brand-new Perks, for a total of over 160 crammed into this PDF.</p>

Perks. Because everybody likes a little something for (nearly) nothing.
-- Paul Chapman