I go to two different breastfeeding groups - yes, even now that Kate's weaned! (I still go under the guise of, well, I'm going to have another boobie baby in a few months.)
I go to the local LLL meeting when I can, it's once a month. There's a general topic, though if it's just the normal girls then we don't really bother repeating it much. Mostly we just chit chat - about nursing and other baby/toddler stuff. For me too it's the only other place I see toddlers nursing and get to talk about that with people who understand the nursing gymnastics and social pressures and all of that. It's a really nice group of ladies, and Kate enjoys playing with the other kids.
The other meeting I go to is a free support group run by an LC from the hospital I birth at. It's mostly younger babies, so I don't go for my own support, but I think the newbies really appreciate talking to someone who is further down the road. Most people stop going when their babies get mobile, it seems. (And for certain it can be difficult to entertain Kate without her stealing the baby toys and trying to touch everything.)