I've been working on a Druid Stats spreadsheet for some time now. It was also based on the rogue DPS spreadsheet posted on these forums, similar to Voldin's. I originally posted it to the
WoW Druid Forum, but it was drowned out with spam as 2.3 changes were announced at the same time and I didn't bother the bump it.
http://hosted.filefront.com/mijae
This spreadsheet includes both DPS and tanking calculations. It supports selecting a DPS cycle model and a tank point model. In addition, the calculator can mix models to determine an off-tank value. A weight can be set to scale between dps or tanking. DPS cycles available range from custom models for mangle only, shred only, or "standard" mangle/shred to 4+ cp. I'm currently working on bear threat as a DPS model as well. Any alternative model can be integrated in based on stats/gear/talents.