I just spent the ENTIRE day going through the Guitar Rig and Reaktor user libraries, and downloaded literally HUNDREDS of patches and Reaktor ensembles, going back as many as 7-8 years.
Reaktor 5 goes back something like 6 years, and even ensembles created for Reaktor 4 still seem to load up into Reaktor 5, so I went through literally something like 1300+ user-created synthesizers created for Reaktor.
I also went through hundreds of Guitar Rig patches, and downloaded a whole bunch of those too - they work GREAT, even those from prior versions of Guitar Rig.
I don't know if you have other NI components, but there is a free set of something like 8000 patches for FM8, that are every single Yamaha DX patch ever released - including DX7, DX9, TX series, etc, and they sound GREAT when you load them into FM8.
SOOOO, those user libraries are a gold mine, as well as other locations on the web for patches and such.
Bob Bone