This version is a bug-fix release addressing an incompatibility that prevented some iPhoto 6 and '08 users from being able to export.
This is the recommended version for all users. Apologies to those v 0.7 users that were bitten by that bug!
As of 11:11pm CST Sept 20, 2007, I have updated the 0.7.1 installer. Some file permissions were not set properly, and blocked access to non-administrator accounts. Thanks to everyone that helped me solve this issue.