I just uploaded a much needed Reference Manual and Design Guide. I am an expert desktop publisher, so the Design Guide is slick. The Reference Manual is generated by Doxygen, which I'm still learning. Nonetheless it is extremely valuable to anyone mucking about with OT.
Expect a new version of the Beta in days. This will include the standard bug fixes, mostly to the UHF module. It will also include revised IAR workspaces.
For the record, the FREE IAR Kickstart for ARM is fine for OpenTag. Our friends at Arira promise to have some hardware soon.