Here's one from the "revenge can be sweet" department…

Clark has spoken in the past about sites where consumers can share their collective wisdom about businesses (Yelp.com) or the travel experience (TripAdvisor.com).

Well, what if a business wants to find online reviews of customers so they can avoid the bad ones? BusinessBeware.biz offers just such a service for a nominal fee of $5.

If customers can diss a business online, now business has its own website to diss customers! Of course, the idea is simply to help business owners vet out the "bad apple" customers and steer clear of them.

Meanwhile, ServiceLive.com is a related service that allows you to name your price for small home-repairs. You essentially put your small repairs up for bid online.

ServiceLive.com is free for consumers. They take a 10% cut of the price you pay the contractor. And a part of the money they collect is used to do background checks on contractors.