Today I have for sale Whoizard.com runs on a custom/unique script, first it checks the availability of the domains entered. If the domain is available there is a link to buy it, can be replaced with an affiliate program. If the domain is taken then it offers a Whois link.

Traffic is minimal.

3 potential revenue sources:

Adsense
domain affiliate
selling copys of the script.

Bids start at $25
BIN $200
Ends Saturday 9pm GMT