Classic delicious extension for Firefox
The current latest version of official delicious add-on for Firefox replaces your standard browser bookmarks with bookmarks from your delicious account, besides providing useful buttons for bookmarking a page and bringing up your delicious bookmarks.
If you are interested in just adding the buttons and not the entire functionality provided by the official add-on, you might want to get the classic version. Unfortunately the add-on that page is not compatible with Firefox 3.0+. It has been modified to work with the latest Firefox by Micah Sittig and can be downloaded from here.
I have created a mirror for it here.
How the add-on works
The above add-on adds 2 buttons in Firefox like so:
Clicking on the
button takes you to your bookmarks page at delicious.com.
Clicking on the
button brings up a window like so:
where you can enter description for the bookmark (up to 1000 characters) and your tags. The tags can either be selected from recommended list at the right or typed (suggests your existing ones as you type)
Setting up keyboard shortcut to bookmark a page to delicious

bit.ly is another web service like the popular tinyURL. You paste the long URL in the text box at bit.ly, optionally set a custom keyword and click on Shorten button to get the shortened URL.