I found an interesting feature within Firefox a few moments ago: you can attach a keyword to a bookmark such that when you type the keyword in the address bar, the associated URL is opened.

For example, our project management system (Copper) lives at http://thefrontiergroup.com.au/copper - a fairly sensible URL. I can now type "copper" into the address bar and Firefox will load my bookmark automatically.

Simple, but very useful, especially as I tend to keep my TFG bookmarks hidden away in a folder on the bookmarks toolbar.