Social bookmarking sites like Digg where users vote on the quality of links -- the best rising to the top -- are transforming the Web-using experience. They do this by harnessing the power of public opinion to vet, filter and rank "content."

Now -- at last -- someone has harnessed the power of the Web 2.0 to discover and rank great deals. Call it social bookmarking for cheapskates.Called DealsPl.us, the site seems to emphasize gadgets and electronics, but the categories include Audio/Video, Cameras/Camcorders, Communication, Computer Accessories, Computers/Software, Electronics, Games, Home/Garden, Media/Storage, Monitors/TV, MP3/Media Players, Office, and "Others."

Each item shown has all the information you need to make a decision except source and shipping cost. The data shown for each product includes the expiration date of the deal, the original price, a link to compare pricing and icons you can use to vote on, comment on or e-mail the item. And, of course, the killer price that makes it such a great deal.

Looking at the site today, I see a 1GB SD card for $9.99; a Garmin Forerunner 201 Wrist-mounted GPS training gadget for $95; and 100 DVD-R disks for $20.

These are seriously good deals. Incredibly good deals. And thousands of them. And, like other Web 2.0 social bookmarking sites, DealsPl.us only supplies the structure. Users find, post, rank and comment on all deals.

And, of course, the site is totally free. What a deal!