I spent several hours with the hummingbirds this morning at Patuxent Wildlife Refuge.  WRPerry had alerted me to the nearby observation tower which was surrounded by Coral Honeysuckle, so that's where I set up my tripod.  I found this much more difficult than capturing them at the feeders because there was such a broad area to cover.  I took hundreds of shots but only got a few that I was happy with....and I was totallly exhausted by the intensity of it.