Bought a “Mini Wireless PC USB Computer remote Control controller” on eBay for use with XBMC (XBian 1.0Beta1.1) on Raspberry Pi. £3 including postage. Consists of an infra-red receiver which plugs in via USB and the infra-red remote control itself. Just works, no drives or setup required.
Shows up within Linux as an Xenta device.
root@xbian:/# lsusb Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. Bus 001 Device 004: ID 1d57:ad02 Xenta root@xbian:/#