I use Growl with Adium, and frequently get a message that I don't need to respond to. But Adium sits there in the dock, blinking at me, begging for my attention. Perhaps it feels neglected, but I really just want to leave it in the background and keep working. And still it blinks. Eventually I get frustrated and bring it to the front, but by that time I'm annoyed with it.
What I suggest is the option to disable the blinking after a few seconds. A non-blinking indicator that there is an unviewed message would still be nice.
I can't use Adium on this computer right now, but I'm almost positive you can turn that off in the Dock preferences (where you change the icon). I believe there is an option to both stop the bounce and turn off contact names in the dock.