I used to use a bookmark management site called Backflip since the late 90’s. After the Internet bubble burst some years ago, the offering was discontinued. Presently, there are several other great services that can store all your bookmarks and make them accessible form different devices and computers.
Google has a comparable service as part of their plethora of web applications. The bookmarks are easily accessible if using Firefox and the Google Toolbar.
Delicious happens to be one of the most popular “social” bookmarking sites. Delicious makes it easy to share your bookmarks and also lear what other people are bookmarking.
If you use a Mac and an iPhone, Apple’s .Me service keeps bookmarks synchronized between devices. These include any MacOS computer, iPod Touch, iPhone, or iPad. Synchronizing is automatic. In other words, you will be able to access that great website your friend recommended in your home computer after bookmarking it on your iPhone.