When I enter a custom food, I enter a serving size in parenthesis after the name. Then when I include the food in a daily log, I just enter 1 serving, .5 serving, etc., depending on how much I've eaten.
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days