I'm kinda interested in HIDMaker FS:
http://www.tracesystemsinc.com/usb_tools.ivnu

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Not merely a function library that you have to figure out: HIDmaker FS generates complete, fully functional programs, for both PC and PIC, that you can just compile and run in minutes!

Full speed 18F4550 family:
- MPASM
- PicBasic Pro

Low speed 16C765 family:
- PicBasic Pro
- MPASM

Can create standard USB HID devices (e.g. keyboards, mice, joysticks) that can be read directly by Windows. Can automatically create special devices, too:
- Devices with multiple USB Interfaces.
- Soft Detach Devices with multiple personalities
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A tad expensive though, $599 USD. But if the software does as much as it claims, it seems rather interesting.

Robert