ShouldExist http://www.shouldexist.org/
Designed to assist the free exchange and discussion of good ideas. Good for prospective inventors to check out regularly and for people to post their desires for products that don't exist yet.
Invent Resources http://www.weinvent.com
Elegant, cost-effective inventions on demand from experienced and prolific senior scientists/engineers. No speculative R&D investment required.
InventNET http://www.inventnet.com
Internet-based organization, helping independent inventors worldwide develop and market their inventions.
Delphion http://www.delphion.com/
Free patent searches of US, EPO, and WIPO data, including web access to scanned images of most indexed documents. U.S. data begins in 1971.
Canadian Innovation Centre http://www.innovationcentre.ca/
The Canadian Innovation Centre (CIC) is dedicated to assisting inventors and innovative companies. Services includes invention evaluation, technology due diligence, market research, and education programs.