These are usually anti-spyware or security software applications that use various forms of deception and/or unethical means or show a history of negligent false positives to goad the end user to make a purchase.
In some cases these applications maybe downloaded with some form of unwanted software at which point the rogue application is offered to the customer as a way to remove the unwanted software.
X-Con Spyware Destroyer is a Rogue Antispyware which displays false spyware information. In our sterile test environment we seen several legitimate applications being detected as malicious software.
All I can say is boy do you ever have this one wrong. In fact, because of your writing on X-Con it made me curious so I checked it out. I wound up buying their product for our test program and man it is one of the best I have seen. I write for three Canadian University newspapers and one section is nothing but an anti-spyware section. This section is directed at products that claim to protect against spyware so that students can be more aware of what to buy and what not to buy in order to protect their term papers, and personal information. The computer departments receive the anti-spyware products that we are testing so that the programs can be put through their paces and then I write about the results. X-Con Spyware Destroyer EH came out on top. I have to admit I was surprised because one of the products running against X-Con was a well known product and X-Con knocked it out of the park.
Anyhow, I found the product here on your site and so I am returning the favor. Sorry SpywareGuide but you really need to check things out before you add them as a bad product. However, it is your site so you can do and say what you want. A suggestion though, perhaps worry about the real damaging malware rather than another companies anti-spyware product that may compete with yours.