As for other gear, I've worn the maternity belt a few times. I'm still trying to figure out the best way to position it on my hips/waist (ha ha as if I have a waist) but I think once I get a little bigger it will be a great "accessory". The one I have is the Gabrialla Maternity Belt, in case anyone is interested. I wear it over my Bella Band so it has a smoother fit and sometimes just the band alone feels pretty good support wise.
On my fun trip to Portland last weekend (it really was a blast, thanks Yvonne & mom), my mom hooked me up with an early birthday present which included a nice headband/ear warmer thingy (yes, that's its technical name) and an awesome running jacket (we hit the Nike outlet). The best thing about the jacket is that has normal rain repellent fabric on the top part that overlaps a stretchy spandex like material over the rest of the coat which will allow plenty of stretching for my ever stretching belly. It actually looks a lot cooler than I am making it sound.
I wore the ear covers the other morning but ended up getting too hot so had to take it off my ears, but once the temperature drops a little they are going to be awesome! I really like it because it's covered in reflective dots so people can see me coming when I'm out and about early. As for the jacket I wore it for probably 15 minutes total the other day on a run but it really was too warm and not raining hard enough to necessitate it. As we get deeper into Eugene fall/winter it will be very beneficial.
So, short story long, I've just about got all the gear I could ever need to keep running through this entire pregnancy and beyond. The only thing that I don't have that I will probably look into is some sort of headlamp to wear on my early morning runs... I haven't tripped yet but it's starting to get pretty dark and its inevitable that I will sooner or later if I don't do something to illuminate the path.