This website has a great idea for tracking honey bee health. Just sign up and enter your information about your yard or garden and they will send you free sunflower seeds to start, and just check out the bee's once in a while and report what you see.
The number of bee's located within a specific small in a certain period of time is crucial for understanding the population of bee's. I usually look at a square foot of the lawn (full of dandylions and unmowed of course!) and time it for 30 seconds to a minute, and if I see three or more bees in that time then there is a healthy population of bees and a definite increse in pollination!
Don't forget that keeping bee's will increse your blooms and yields in just one season!! Want more flowers? Want more fruits on your tree's? Get a beehive!