That was the first thought that struck me when I saw the headline and tried to guess what the posting was about before clicking the link. At least 2-3 times per week I find myself wanting something like this. Often it involves leaving my email address or my phone number to have someone contact me. Or having to check back.

In its simplest form, this isn't all that hard to build. The tricky bit is to get people to use it. And perhaps even to explain what it does and possibly how it works.

If someone knows how to sell it, I'd be willing to build it.