I am currently trying a new email client called Mailplane and have 5 invites to give away to first 5 commenters leaving their names and email addresses.
Mailplane links your Gmail account to your Mac (only for mac users) and it appears to do various bits of useful stuff
- drag and drop files as attachments
- send photos via email as it has a default iPhoto plugin
Here's a review of it. I have not yet formed any opinions because I've not used it much yet. But get it while it's free.
First 2 readers to leave a comment etc also get a skitch invite because I have 2 left as well. (Also MAC only application.)