Release notes:
http://support.amd.com/us/kbarticles/Pages/AMDCatalyst116ReleaseNotes.aspx

Doesn't state anything relating to the Stream SDK but will be interesting to see if it has any effect on mining.  I'm not going to be testing just yet but may do in the next couple of days...

If anyone does upgrade, please post results!

Cheers 

Hi guys

I've just picked up 3 x Club3D 5870 Overclocked edition for $260 AUD each.  This is the config I have them running at without any tweaking of the miner:

OS: Windows 7
Driver: Catalyst 11.5
SDK: 2.4
GPU clock - 1000mhz
Mem clock - 900mhz
Fan control - 100%

These settings have been applied using the Catalyst Control Centre - AMD Overdrive

So now for the results!

420MH/sec with poclbm.exe -v -w128
Temp: 56C !!!! (this part just blows me away)

I'm about to start playing around with Phoenix and see if that gives me any better results!