I recently signed up to be part of the bee counting project. There is a group called the Great Sunflower that is drafting ordinary gardeners like myself to help count bees this summer. You sign up and receive a free packet of Lemon Queen sunflower seeds. You then grow these seeds and when your plants flower you count the bees that come to your sunflowers. There are instructions on how to do this at their website. If every gardener in the U.S. did this, then we could get a better idea of what damage the Colony Collapse Disorder has done to the bee population of the U.S. and Canada.
If you are interested in joining up, their website is: greatsunflower.org.
This sounds like it could be a great project to do with kids or grandkids.