Cgminer is working ok for me, -s 1 -q 0. I've probably spent about 36 hours mining it with a 5830 and I've gotten about 60 blocks I think. Lots and lots of rejects. It took me a while to realize I needed to lower the scantime (duh!) and it seems to have picked up quite a bit since I lowered it.
Couldn't seem to get poclbm to do anything but I didn't mess with it much. It seemed to connect ok and it showed about the right mh/s but nothing ever seemed to actually happen. No accepts or rejects after a hour or so.
The gg client itself seems to be working well enough. Wish I saw more connections though, I'm usually seeing them in the low 20's. I think the highest I've seen is 29. With the .24 bitcoind I normally see over 100. Running Ubuntu 10.10 x64 on a single core AMD.
I did get the time warning message when I first started the client yesterday. As soon as the block count caught up I stopped and restarted the client and I haven't see the warning since.