There are new (23 Mar) drivers on Razer's homepage labeled NDC, which apparently stands for No Drift Control. Drift control appears to be some feature in the razer firmware that seems to have something to do with prediction. This is what is says in the driver description:

Turns off mouse drift control (aka prediction).

NB: Most low/mid sensitivity users prefer to retain the Drift Control feature (also known as Prediction). Do not flash to the NDC firmware unless you prefer to switch off the Drift Control feature.


So what gives?

PS: Here's the link for the NDC drivers for deathadder: http://www.razersupport.com/index.php?_m=downloads&_a=viewdownload&downloaditemid=134&nav=0,11