I'd been on the lookout for a good grid theme for ages, but nothing seemed to do exactly what I wanted. Also I love Picasa, and wanted a way to incorporate it into WordPress.
So after a google search the other day, I found this plugin. The site now seems to do exactly what I want (well, almost). I like how the thumbnails show the image at the correct dimensions with no cropping.
This is excellent for art sites where you want the visitor to view the whole picture in the thumbnail, not matter whether it is landscape, portrait, long and thin, or square.
And to top it all off, I can use Picasa on my computer to update the albums that appear on the WordPress site. This is brilliant. This is going to save so much time.