Delicious, as the sort of "grandfather" of social bookmarking sites, is a great resource if you 1) have friends or people that you'd want to share bookmarks with...2) you don't mind a monochromatic theme...
I actually really like Delicious BUT sometimes, my eyes go crazy because of the plain old black and white theme...I think that makes it hard to find information. I also really like that the website streams the most recent and most popular bookmarked websites...
This is a so so that looks like it would be simple but yet I had a difficult time attaching and creating bookmarks. I think I would try something else.
Social bookmarking site that takes your interests and suggests new sites that connect to what you like. Great way to find sites that you don't even know exist
Unfortunately, faves has gone out of business as of the 25th of May. It had many of the same features as delicious but I guess it just couldn't compete.
You can enter study sets by dividing the type of vocabulary (food, condiments, items, etc.) or grammar you want to learn. It offers flascards, a quiz, auditory quiz, a study bookmark so that you can chose the topic. It also has an statistics button to track your strings and weaknesses.
If you have research to do this is a great site. However it is not really designed for K - 12 unless you are assigning a real research project. Many of the groups have you apply to join their group but many you can just join.
Never lose a cool web page again, easily find your links in a blink of an eye :) After exploring Blinklist I found that it was easy to add links, and import links from another source to Blinklist.