Check out the recent "Developer’s Alarm: 200+ Hotkeys To Boost Your Productivity" from Smashing Magazine for more hotkeys. This focusses on Windows apps, but there are some apps that have cross-platform support, and so this isn't an entirely worthless post.
In the spirit of previous posts [1, 2, 3], here are some more!
I found TechCheatSheets.com, which includes some nice reference sheets, and some broken links. However, it got me thinking about "cheat sheet," which got me searching, and I found these popular links:
PDF, LaTeX). However, those do not replace my Camino quick reference (PDF, LaTeX).