it seems to!

I will say, on a PC I have always done fresh installs for any OS upgrade.  A factory reset may remove any registry errors, etc that the upgrade left. ( i don't know if Android uses a registry system like windows)

so, it does seem to work.  Also, with any of the custom 2.2 roms and "leaked" verisions, it has helped to clear cache and factory wipe before applying the updates. 

Maybe worth trying a factory reset before updating too.

dj.