OR buy a USB-to-Serial converter. If you don't want to mess with the SMD soldering and if it's for a single ended product, that's a fast solution.

On another hand you can still use a USB PIC like the PIC18F4550. Using Mecanique EasyHIDMaker save you many developpement, reading hours and so on.

FTDI are great so far. I know it exist some other.. that i don't remind.. OOps! For sure there's some user here who remind.

Good luck!