I've been remiss in not mentioning this on the blog:
GURPS Combat Cards Now Available
One of my players uses combat cards; I think a few more would benefit from having them in front of them so we wouldn't have the same questions so often (Usually about doing a "Wild Swing" - they mean Move and Attack - and defenses, or what your options are on Committed Attack when you take an extra step, and All-Out Defend.) It's a good way to do "No Rules Lookups in Play" and yet have the rules at your fingertips.
They're $12.95 on Warehouse23.
They real, potentially crippling downside to this set is that it's Basic Set only. It's Martial Arts that introduces a lot of options to combat, and Martial Arts really needs a set of combat cards for its options. For now, we'll have to stick with notes and home-made cards.