Last time I did research the BodyMedia Fit was arguably the best on the market at the time. Well, they no longer exist and were bought out by Jawbone. What's the go-to product these days? What's the most accurate? Any suggestions?
Calorie tracker as in online app? Or a physical item? If the earlier, I use MyFitnessPal and its great. Others I know have used it as well and feel the same about it.
Caloriecount.com or whatever it is is also a good one when on the fly. Compare it to myfitnesspal to get an idea if discrepancies and find the middle ground.