What percent of surfers type in url?

[Halfdeck]

I imagine more than a few surfers will type in the url instead of clicking on links if they don't trust your site and the link in the status bar is a mile and a half long or if it says something dubious like "free porn" on mouseover.

Also, if the link has ref codes at the end, some people have a tendency to just cut and paste the main domain url into their browsers instead of clicking the link.