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Esri Maps for Office is a powerful add-in for Microsoft Office that brings the capabilities of Esri's ArcGIS Online mapping platform to Microsoft Excel and Microsoft PowerPoint users. With Esri Maps for Office, you can easily create interactive maps of your organization's data, enabling you to see patterns that graphs and charts cannot reveal. Any of the interactive maps you create can be embedded in PowerPoint, so you can make your presentations even more impactful. And by leveraging ArcGIS Online, you can quickly and securely share your interactive maps in web pages, blogs, and mobile apps as well as with ArcGIS users.

ESRI's home page for K-12 GIS resources. Download free software and find links to lessons for your classroom

My impression of this site is "Data 2.0." I like that the data is organized by category, you can upload and download data, and it has graphing capabilities. It could be a little stronger on the mapping aspects, but if you find the data you are looking for here then it is worth it. Also, there may be social aspects to this site that I have not explored yet. Similar to the geocommons finder without the mapping component.

Historic maps, multiple viewing options, some available for download, I like the timeviewer where you can view maps through time.

Great historic maps website with multiple viewing options.