Visual Guides for Finding Prior Art Online

Finding Prior Patents
• EPO's Espacenet
• Google Patents
• Intellogist
• PatentLens
• WIPO's PatentScope
• PatentStorm
• PriorSmart
• SumoBrain
Finding Non-Patent Prior Art:
• Association for Computing Machinery's Digital Library
• CiteSeer
• Dspace@MIT
• IEEE Computer Society and Xplore
• IET Digital Library
• Intellogist
• Google Scholar
• QSensei
• Social Sciences Research Network
• Software Engineering Institute's Digital Library
Also check out how to figure out which US patent is assigned to what person or company.