This site is a great resource for keeping track of the environmental scope and sequence standard for each grade level. Annette Drewes did a great job of introducing these to us in our June workshop.
Not exactly sure here, but a project to have students talking with older generations about places in history and documenting on a global map their shared stories? Seems like it read my mind!
This is an awesome site that has combined a lot of student literature with Google Earth mapping. You do need to have Google Earth downloaded on your computer to use. Free!
Here is an example of a collaboratively built wiki. This was assigned to college students who had one week to build it. What topics do you teach that students could build collaborative wikis around?