Auctions have been around for centuries. They became popular in 17th century England.
English (ascending in price)
Dutch (descending in price)
Sealed-Bid auctions
Open-Outcry Double
Sealed-Bid Double
Reverse (seller bids)
General Consumer Auctions
C2C
C2B
B2B
B2C
Resources
Advertising Supported
Mixed Revenue
Intranet Portals
Blogs
Wikis
Forums
Facebook, Myspace, etc.
Mobile Communications Technology
Mobile Business
Intelligent Software Agents
Virtual Communities/Web- Online-Communities
Web Community Consolidation