Imagine you're staying over at Grandma's house for the weekend. She's just had a kicking T1 broadband connection installed (hey, who doesn't have a Grandma with a T1? What? Seriously, just me?). You're fired up to download some Linux torrents, or an all night FPS frag-fest. But you cannot for the life of you remember what the stupid URL is for the site. Googling for it doesn't help either, as you can't remember the weird spelling of that site. And was it .com, or .net? AUGH!
Enter Foxmarks. This cool site/utility/Firefox extension lets you keep and maintain one unified set of bookmarks, across any number of computers. And even if your Grandma's never heard of the Fox, you can still log into your Foxmarks account on via any browser and you can access your bookmark list.
I use multiple computers in multiple locations, so foxmarks is tailor made for me. On any new system, I just install the Firefox plugin, enter my account info, and boom -- 5 seconds later, all my stored bookmarks are available through the Bookmarks menu, or Alt+B (for you mouse haters). I've been using it for ages, and I love it!
Foxmarks - www.foxmarks.com
Foxmarks Firefox extension - addons.mozilla.org/firefox/2410/