I usually have enough to do a whole face since I'm always running around and can't be bothered to pack m/u all the time
blot sheets
tinted moisturizer
concealer
highlight pen
brow gel
a neutral cream eyeshadow (metallic beige is great for that "awake" look, but still not too boring. bonus, the tube of it is teeny and a little goes a long way)
mini powder/blush brush
mini bronzer
mini mascara (like the ones you get with GWPs)
a blush or two
a lipstick or two (often, a neutral "day" one and a more vivid "night" one)
mini swiss army knife (tweezers, nail scissors-- useful in a fix, and very compact)
amazingly, I've got it down to a pretty damn small bag of stuff.
maybe, maybe add an eyeshadow or two and some eyeliner if I know I'll be going out.