Every web browser can save your favorite websites in a bookmarks system. But when you travel and use several computers (at home, at work, etc…), it is difficult to have the same bookmarks on each computer.
One solution is to save your bookmarks on the web. And that is possible with Delicious. You can mark your bookmarks as private if you don’t want to share them. Besides, there is a firefox add-on that enables to use and save your bookmarks quickly.
And if you don’t want to give up the HTML format, you can export (or import) bookmarks from delicious.com to a HTML file, as it is clearly explained on Shodan.in blog.
PS : This site exists since 2003 and I’m sorry if everybody already knows this kind of informations, but I’m quite late as far as social web services are concerned…