New drivers for AMD/ATI Cards. Release Notes
New NVIDIA CUDA drivers released 2011-10-24.
For Windows XP x32 I got 285.58 (WHQL) but for my Windowws 7 x64 I got 285.62 (WHQL)
I think for BOINC there is not really any reason to upgrade at this point, although I did my 5 home systems last night and will do my 2 work systems at the end of the work day. No problems noted with upgrade (yet).
New drivers for AMD/ATI Cards. See Release Notes