http://pbskids.org I love this website, there are a lot of engaging games for kids that help them build a variety of skills I particularly like the Electric Company games: http://pbskids.org/electriccompany/#/Games/Collection/ This show and it's related games are a bit more "cool" than some of the things designed for the younger kids. In some of the games they can beat-box with different sounds, it is great to engage reluctant boys. Unfortunately most of the video's you can only watch in the US, but you can find a lot of them on YouTube. They are a really cool way to teach phonics. This is one example:
http://www.tvokids.com This website is loaded with great, educational games for students.It is designed to suite a range of age and developmental levels and it is Canadian!
http://www.bbc.co.uk/history/ancient/vikings/launch_gms_viking_quest.shtml This is a amazing website for reluctant readers. It would be best for students in Junior or Senior High. It is an interactive Viking adventure, where students have to read and make decisions based on the information provided to them.
http://www.woodlands-junior.kent.sch.uk/Games/mag/poetry.htm - There are a number of reading related activities on this website, but I particularly like this one because it allows students to work creatively with language. I also like that because it has such a variety of words to use, readers of different levels can access it.
http://www.manatee.k12.fl.us/sites/elementary/samoset/mainideaprac.htm - This site would be great for students who are good decoders and who are working on comprehension. One example is where a student is asked to read a paragraph and then identify the main idea.
http://www.canteach.ca/elementary/index.html Great resource for teachers with lots of lesson ideas.