Less than two weeks after the release of Mellel 3.2 (12 June 2013), developer RedleX has released Mellel 3.2.1, which fixes compatibility issues with Mac OS X 10.5 Leopard. The word processor update has also restored support for automatic baseline shift adjustments for MathType equations and features smarter application of default languages with new documents. ($39 new from RedleX and the Mac App Store, free update, 105 MB, release notes)
Compare More Easily in Apple Mail
In Apple Mail, if you need to work back and forth between two different views of Mail's mailbox contents, you can do so quite easily. For example, you might want to look at a mailbox holding all filtered-in sales orders from the past week while also looking at a smart mailbox showing unanswered customer questions.
To avoid constantly clicking between mailbox views and losing your context each time, choose File > New Viewer window to get a second window and then arrange each window as desired.