+1 for livestrong.com's calorie counter. It's been an easy go-to to track and learn my eating habits and adjust accordingly, it got me finally paying attention to portions, reading labels, etc. Down 120 lbs in the past fifteen months, so it's probably a pretty good resource.

(Okay, adjusting my lifestyle to make two hours of hard exercise a daily habit probably helped.)

A tip:
Make sure you use "general" cycling, not any of the speed specific selections when you're tracking rides. It averages out to the reasonably respected 40/cal mile formula (although I think it does adjust depending on weight.) Even if you are actually burning more than the calories it comes up with, it's probably not going to be enough to cause a problem. If you're burning less, that's your problem, not the site's. Pedal harder.

As long as you're properly nourished, and as long as you're smart, working harder will only make you better.

Hup, hup, etc.