Purdue Libraries GIS
This guide is designed to bootstrap your project - it features first-stop or otherwise top resources for acquiring geospatial data, doing GIS work, or building geospatial applications. It is not an exhaustive directory of resources, but rather a concise and lean tool for those who are in need of some of the more common and reliable resources in GIS.
Much of the content here is mined from Purdue's GIS Librarian's Trunk.ly feed, which you're welcome to also visit and/or search (below).
For those in need of more advanced help or more arcane resources, the Purdue Libraries GIS homepage is here.
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