I'd like to thank everyone that voted for the next round of plugin features! The survey helped me make sure that the improvements I'm making are the ones that you guys want.
I've updated the survey post with the final results.
Keychain Support was a landslide victory, and you might be happy to know that it's already done and will be included in the next version. The second most requested feature, Auto complete of addresses, requires a bit more thought and even a bit of a change in the way the plugins work. There are several technical challenges, but right now the biggest hurdle is trying to maintain the ease of use and transparency of the plugins... I'm working hard to get that done for the next release as well.
The last bit of information that I wanted to share with you all is that thanks to Richard Kerris, I now have a full version of Aperture with which to continue development of Aperture2Gmail!
I am hoping to release new versions of both iPhoto2Gmail and Aperture2Gmail soon, so stay tuned!