I've gotta agree--an inexpensive food scale and a measuring cup are our best friends for accurately tracking calorie intake. I've been doing this for well over a year now and yes, sometimes I need to estimate but I'd be happy to be within 20%. If what you're doing is working, I guess it's OK but if it's not you might want to start measuring, at least for a while.
47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans)
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12)
Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.