I dont know if this is helpful for anyone. Maybe everybody knows, except me, but ... when wanting to view source code in Chimera, you hit Command-E (the keyboard shortcut for View -> View Page Source). But if you hit Command-E when you're already viewing the source, a save to dialog box appears! There we go: fast and easy download of source code...
Mac OS X Hints
http://hints.macworld.com/article.php?story=20021114061552354