no, you guys are confusing cloaking with url hiding!
url hiding or url cloaking as some places call it, is just to display a different address, like craig said.
cloaking is entirely different - like zoobie said, it is to show a different page to search engines than it does to a normal user. Normally you would have a script that detects the referrer, and if it is a recognised search engine spider, it will serve up an optimised page full of keywords etc. which is of course the best way to get a high ranking. The normal user gets the normal page.
Cloaking is dangerous if not done properly (or even if done at all!) because, although it works, search engines keep changing their minds about whether it's ok or not. So, if you cloak and get found out, you could potentially get banned.
Hope that helps, guys
::] krycek [::