Wireless Communication between microcontroller and PC
If you have a lot of cash to spare, Nordic makes an evaluation kit for the nRF24L01+, part number nRF24L01P-EVKIT, that should probably fulfill your needs.

However, considering the sparkfun product Andy aka posted has the schematic, eagle, and code files available, it would probably be cheaper to have one of those made at oshpark or similar.

You could also use a Bus Pirate as a USB->SPI bridge, and hook that up to one of sparkfuns nRF24L01+ modules, and write a little program to talk to it through the bus pirate. The Bus pirate has an additional IO pin you can use to strobe the CE line on the Nordic chip.