Webquests
As an official introduction to webquests, webquest.org is pretty useful, particularly the Design Map.
Teacher Tap has a nice introduction as does Thirteen.org.
Here are a few free webquest generators:
TeAchnology Web Quest Maker
Filamentality
Zunal.com
You might want to do a Google search for existing webquests that you can use as is or adapt for your own purposes.
