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)
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Show Hidden Files in Open/Save Dialogs in Snow Leopard
In Snow Leopard, if you want to show otherwise hidden files in Open and Save dialog file lists, just press Command-Shift-period. Pressing it again hides the files.