Inspired by Johannes' post-its and Anders' moleskin, I'd like to share my tip'o'the day for taking notes.
Step 1: Find a stack of A3 sheets, big ones!
Step 2: Get a good thick nice pen (mine could've been thicker)
Step 3: Lay the sheets on your desk between yourself and your keyboard (warning, not sure this is ergonomically wise thing to do).
Step 4: Whenever you show off stuff, especially code and stuff you've got on yer computer, support your presentations with drawings and notes on the sheet.
Step 5: When you're done, hand the sheet off to the person you drew it for, or whenever the drawing ends up particularly pretty, smack it up on the wall behind you. Or throw it out if it's all squabbly wabbly.
This way, I don't have to get up to use a flip-over, I don't have to take useless digital pics of the white-board, and I get to show off my l33t UML-skills without having to use some crappy software. Sweet!
Diclaimer: I didn't come up with this myself! Credit is due to our architect, who will be revealed if he so wishes :)