+1 on powermeter (kj = kcals), LoseIt (take the time to input custom foods and recipes, it's worth it). I lost 55 lbs with those two. And the bike of course. General guidelines are cut out the white death (flour, milk, sugar, some would say rice but that's my weakspot) as much as possible and combine foods wisely (protein/veggies, starch/veggies, fruit/veggies). Basically no protein/starch, like every meal in america, which is where the real advice about avoiding fast food applies. I burn about 600 cals per hour on a moderate ride (well below FTP) and 900 on an intense one (up and over FTP).

For months my diet was 2 eggs for breakfast, yogurt mid-morning snack, chicken salad for lunch, fruit for snack, meat / veggies for dinner. Lots and lots of sugarless gum to fight off cravings. Riding days was GU Drink and/or gels about 200-300 cals depending on the intensity/length. Long days was Infinit drinks and Clif Bars afterwards. GL