2 tips on bookmark
Make your site del.icio.us friendly
When people find a page they like to bookmark, they frequently use services such as http://del.icio.us. Adding a bookmark is often done using a bookmarklet, which submits the URL and the title of the current page.
As a web developer, you should make sure the page's url is a "permalink" to the currently viewed item and that the title of the current page includes the title of the item (this site is not a good example, as the page title does not reflect the current item...). Additionally, you can provide submit-to links for the common social-bookmarking services (e.g. digg, del.icio.us, reddit, furl, blinklist, simpy and fark).
Bookmark!
When you find something interesting, bookmark it. Bookmark it like there is no tomorrow. You never know when you're going to need that link...