For future reference: How to conduct a SUCCESSFUL Twitterchat. In case you forget or need a little more convincing on why a Twitterchat is a good tool for you and your students.
ISTE offers a great list of educational twitter chats and hashtags. These hashtags and chats can be found by grade level and include descriptions and chat dates/times. ISTE also offers a list of related articles.
The Edublogger is a great blog to help new users of twitter access twitter chats. The blog is very user-friendly and lists a number of educational hashtags and twitter chats to join.
This website is great because it is a complete step-by-step guide about twitter chats. This website gives instruction on joining and/or hosting a twitter chat. In addition to this instruction, the website offers information on separate twitter sites.