My gallery albums for Thanksgiving through March were successfully posted directly from iPhoto using the very sweet iPhoto2Gallery plugin.
One aspect of the process that is a clear improvement is that it definitely took less time to set up the nested albums, for example.
Alas, however, there appears to be little motion on the iPhoto to Movable Type front. I believe I will experiment with this at some point anyway.
The iPhoto to TypePad project is also apparently moving with all deliberate speed, which is too bad, since one presumes that Atom support will be folded into MTPro.