The American Pshychology Association reviews the research findings about Game-Based learning. The article also talks about pilot programs that were conducted to explore GBL, links are provided to these studies.
The short article discusses game-based learning and constructivism. It also provides links to scholarly articles about the effectiveness of GBL in education. Several of the articles are available for free from the Boise State Library.
This site has links to historical maps of the US and all states, it's a great resource for social studies standards, especially geography, maps, and changes in communities over time. Of the states I've looked at so far, the oldest map I've found is from Virginia, dating back to 1617.
Another great list of Web 2.0 tools. There are a few that should be added in the Augmented Reality section like Aurasma and Daqri 4D, but still lots of good resources. There are also several different choices for Productivity Software.
I've seen Leslie present at several conferences. Her resources are excellent and list many different types of Web 2.0 tools. Look down at the bottom of this page for "Tools You Can Use Tomorrow."
This website explains why spreadsheets are important teaching (and learning) tools. They cite research based studies and give examples of how they can/are being used.
This is another great resource from Harvard, there are actually video lessons available from Richard Mayer talking about each of his multimedia principles.
Here is another site with educational games. This one is organized by content, but it also is broken up by grade-level. There are also some language learning websites listed.
This website has links to many different instructional games for kids. It's broken up into different categories based on content. I tried a few games and kids would like them and, of the ones I tried, there definitely was educational value in them. Though the games are geared toward elementary students, it would be nice if they were also sorted (or sortable) by grade-level.