a2a_config.prioritize = ["facebook", "twitter", "wordpress", "friendfeed"];
I don't use many. But it's good the way you have it with only a few available at first glance, then more available beneath.
My main method is to browse news on my mobile, then post to Facebook and/or tweet. When on my desktop, I usually copy URLs then go to Facebook. If I'm tweeting, I'll use this
What would work best for me is something like this:
What wouldn't work here is something like I use at Cynic.me
That's too clunky for here.
The current thing seems pretty good, though eliminating a click would be better.