My girlfriends G Talk on the droid is still doing this. When I'm talking to her using google talk from a PC, it shows her as signing on and off CONSTANTLY.
I have never noticed whether or not this happens within the G Talk app on the droid.
I'm also starting to wonder if my droid does this, and I just don't know it. I would venture a guess probably not, but I'm also usually signed on to G Talk from at least 2-3 places between my phone/work PC/home PC/laptop, so it might not be noticeable.
I have not had any issues with it showing me (or my friends) as "offline" when they are actually online, thankfully. I still hope the sign on/off cycling is fixed soon though.
UPDATE:
just looked at my phone, and my PC at the same time -- the phone doesn't register her signing on and off constantly, just on the PC.
FWIW -- I use Pidgin for all my IM'ing on my PC. But I did just download Google's GTALK app, and it does the same thing. Looks like the phone doesn't update often enough to catch it, but the PC does.
Thoughts anyone?