GreaseMonkey Scripts
GreasyGears
Greasemonkey × Google Gears ≡ Pure Awesome
View any web page offline, from within your browser. Has the further advantage of improving load times and reducing bandwidth usage. Incredibly useful for browsing documentation online.
Still in ‘alpha’, I’m afraid. Watch this space.
Tested on Firefox, but mostly developed in Safari because it implements and has native debugging support for the new HTML 5 client-side data storage specifications is so much more awesome. May work for other browsers too.