Skyrim Monster Mod is being updated to version 10 right now. The file is currently being uploaded to the Nexus and should be available soon. This mod adds lots and lots of additional enemies to Skyrim's various landscapes and increases the number of enemies in some areas. Think of Marts Mutant Mod for Fallout.
Download the new version here when it becomes available - http://skyrim.nexusmods.com/mods/9694/UPDATE
: Download on the Nexus. Latest version is 10d
Check out some screenies of the new enemies by clicking here