"Tis the swarming season" -- be ready if you want to capture a swarm. You might set out a bait hive in an attempt to get them into a place of your choosing. A few drops of lemon grass oil in an empty hive might help. A frame or two of empty comb is helpful as well.
Thanks to Jane for a link to another article on CCD. Researchers continue to search for answers for this global bee problem. Good links on this also.
The EPA will be deciding this week whether to continue allowing use of the pesticide Clothianidin, that's causing bees to die-off at an alarming rate. You can sign a petition to urge the EPA to take action, before it's too late for this cornerstone of our food system.