The LPC 1343 is a nice chip and the dev board works well. Unfortunately this chip is basically ignored by LCP and the community is just not there. I just don’t have time to get a USB stack working with this chip. Because of this i decided to go with the mbed LPC11u24. mbed has an outstanding user community including an awsome cookbook page which includes a USB stack that has wonderful examples. Hell someone even wrote some interface code for the ADNS-9500, which to be honest i was somewhat disappointed at, I was looking foreword to doing that myself(still might).