The LPC1343 Code Base and LPC1114 Code Base both include wireless support thanks to Chibi, an easy to use, open-source 802.15.4 wireless stack from Freaklabs. Unfortunately, this didn't make its way into the documentation yet. To try to explain the basics of how to take advantage of it, we've put together a couple tutorials, and will try to add some more wireless content and projects in the near future:
We're currently working on adding new wireless functionality to the code base for the LPC1114 and LPC1343, and an easy to use .zip file will be added to the relevant project pages when things have been tested a bit. You can always check the appropriate google code page, though, to see what's new.