I’m a pretty big fan of Mozilla Thunderbird. The project has adopted the multi-channel development model of Firefox (which was adapted from Chrome’s) which is a good thing as far as I’m concerned. Instead of the nightly, Aurora and beta channels, though, Thunderbird’s channels are named Shredder (ha), Earlybird and Miramar. With the new names comes new logos, courtesy of Sean Martell, Lead Visual Designer for Mozilla.
I’m almost tempted to use the Earlybird builds just for the logo.