Uncomplex has released Mailplane 3.1 with a number of improvements to the Gmail-specific email client. The update now enables you to switch between an unlimited number of Gmail accounts (previously, Mailplane limited you to 10 accounts), adds an option to suppress notifications of unread messages in the menu bar and the Dock (if you don’t need to see the count of unread messages taunting you everywhere you look), automatically hides the Gmail header when printing a message, fixes the Quick Look previews of Office documents in OS X 10.9 Mavericks, and fixes a bug with Google’s recently updated sign-in interface. ($24.95 new, free update, 17.2 MB, release notes)
Adding Links in Snow Leopard's Mail
Apple Mail in Snow Leopard now has a Command-key shortcut for adding a link to an email.
If you use plain-text email, this will not be helpful at all, but if you send styled email, it's a nice shortcut for adding URLs to your email messages. Simply select the word(s) you want to make into a link, press Command-K, and enter the URL to build into the link.