Failed software commerce schemes?

3dshopping.com

* I'd really like a "store google" to find stuff in stores using an isle or shelf map. Hunting is a PITA time-waster. I even considered forming such a company once to scratch the itch, but other things pulled me away. -t

pets.com

colorcase.com  [what did their business do?]

See also DotComedy for other goofy ideas that failed.