Have nothing to do this weekend?
Spend a few days at this site.
You'll wonder how you ever survived without the Internet!
There are tools for everything - Footnote.com:"millions of historical documents," cogmap.com: an organization chart wiki for companies (Microsoft is the most popular chart), mydecide: let the community help you make major life decisions!, stikkit: "little yellow notes that think," mxgraph: an interactive drawing and diagramming tool.
Don't take my word for it - explore it yourself. See which ones will help your productivity and which ones will help your students. So many possibilities.....so little time.....
And remember to take a break for lunch....
(Disclaimer - I did not check all of the tools on this site; some may be appropriate for adults only.)