LiveBinders.com
If you are a Type-A organization nut like me, you'll love LiveBinder. Not only can I virtually store my resources in tidy little organized virtual binders (I can even put topic-appropriate images on their front covers!), but I can just give the url of the binder to my students, instead of a list of sites to visit. Students can then click on the tabs in the binder to visit the sites I've stored there. This has been a great resource for units, since I can preview a list of research sites and then feel comfortable with allowing my students to access those sites independently. I even have a "LiveBinder It" icon at the top of my internet browser, so that I can just "drop" websites into the appropriate binder if I find something great! One other feature is that you can choose whether you'd like your binders to be "searchable" by other users - they can't change anything in your binder, but they could copy tabs as resources.
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Sqworl.com (I'm not even going to tell you how long I spent sounding that out. Just FYI, the answer is "squirrel")
This site lets you share multiple links in one url - a great strategy for sharing sites with students.
I don't personally use this site, but I've had several other educators tell me that it is great for YouTube video links!
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PortaPortal.com
You know what my students call this, right? PortaPotty, of course!
However, we use this site almost every day. It's a place to warehouse site links, organized into "folders". I like that you can open each folder and have sub-folders - within my "math" folder, I have an "area and perimeter" folder and a "multiplication games" folder, etc.
This site also lets you search other users' folders, which is a great, fast resource for new sites!
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