Not much news on the radio side for the HTC Desire. I found this one on a Chinese website with a lot of ROMs for different HTC phones.
At the moment I am using this Radio. Not much difference to the 32.49 radio. But I see a little bit improvement in the battery consumption. THE RIL files for this radio are the same as for the 32.49 radio.
You can download the radio ROM and the RIL files from my download pages.