Yes, there are three distinct species in this grouping. I've never seen this much variety before in such close proximity to each other, so I thought it was really interesting. It may be quite common as I don't have much experience with this kind of thing.

One trend I am beginning to see is that most users on here seem to have unique experiences and I think it is the sum total of these that will, when combined, give a more accurate picture of the behavior of Butterflies. So, maybe in that sense, these pictures could be useful.

One interesting thing about this particular picture is that, in my experience, Hackberry Emperors will fight for dominance of their territory. About 30 feet from this tree where they communed together in peace, the Hackberry Emperors that inhabit my back yard won't let each other rest because of territorial fighting. They will constantly fly at each other and chase each other away, and some of them were even so bold that they would fly at me and strike me quite hard trying to frighten me away. However, dominance only seems to be a factor when mating is involved. When it's the buffet table, it's come one, come all!

Puddling is not uncommon, but to have several species so close to each other is very, very interesting, at least to me.
I would love to see a video of the behaviors that you describe.

I never thought of something like videotaping them. Perhaps I can do that next year. As I look through my records, the last Hackberry I saw in 2006 was on October 3rd. This year, the last one I saw was on September 24th, more than a week before they disappeared last year. Does Bug Guide have a place to upload short video clips?

We discussed videos in the forums a couple of times, but nothing came out of it. In the meantime I post mine in youtube.com:
http://youtube.com/profile_videos?user=bmoisset&p=v
Sean does the same:
http://youtube.com/profile_videos?user=smccann27&p=v
We tag them "insect behavior". There are others with that tag.
Have fun.