There is a new HTC HD2 ROM out, build 1.48 WWE, and it fixes some annoying bugs like the calendar one which would not allow you to go past the end of the year, and also appears to improve speed in general.

In this video about Xmoo gives us a run through of the improvements. The new ROM can be installed in any unlocked device without HardSPL and can likely be found in the usual locations.