I think I'll start using this more for multiple photo updates. Mostly because the photos are huge and that's important to me, but I can upload photos to Picassa directly from Aperture with Ubermind's Aperture To Picassa Web Albums plugin you can get here: http://www.ubermind.com/products/aperturetopicasawebalbums.php
You simply select the photos in Aperture you want to be in the gallery. Export with the plugin to Picassa. Make the gallery in Picassa and and embed it in the blog. Like magic, it appears as a huge gallery.