Stickshift Software has released Mailsmith 2.3.1, which fixes a bug that prevented Space-bar navigation from working properly, plugs some memory leaks, and avoids checking the installed version of SpamSieve to avoid problems with newer versions of SpamSieve. (Free, 25 MB)
New Documents in Snow Leopard's TextEdit
In the Snow Leopard version of TextEdit, you can now create a new document by Control-clicking TextEdit's Dock icon (when it's running), and choosing New Document from the pop-up menu. This isn't a major feature, of course, since you can also just press Command-N while in TextEdit, but consider Control-clicking other applications' Dock icons to see what functions they might make available.