There is a new ROM release from HTC for the Tytn/Hermes. This has the following versions:
ROM: 1.35.255.2 11/14/06
Ext Rom: 1.35.255.102
Radio : 1.18.00.10
Protocol: 32.55.7018.01H
OS Build: 14955.2.3.0
Bootloader: 1.09
I took the plunge and started the upgrade. Keep in mind there is some limitations with bootloader 1.09, you cannot downgrade it back to 1.06 or 1.04. Read more about it at Xda-Developers Wiki
While you are at it, take a look at the speed comparison of the ROMs, the new one is impressive – Speed Chart
Also the full thread on Xda-developers , can give you some more