Another free utility:
http://www.jddesign.co.uk/
DLLReg (1KB)
This one is simplicity itself! It's just a simple registry file (DllReg.reg) that I always find extremely useful to install on any system that I'm developing on when working with self-registering DLLs.
All it does is add registry entries to register 2 commands for .DLL and .OCX files. These commands run the regsvr32 commands to register and unregister files.
Download the file and Merge the information to your registry. You'll then have a "Register" and "Unregister" context menu for .DLL and .OCX files.