Site cloaker (a little ot)

Hi Guys, I have been reading a lot about "Site Cloakers" to increase traffic to ones website via the search engines. After visiting the script archives (hotscripts,scriptssearch etc) i have found a couple but most of them are commerical as well as being REALLY expensive with closed code (i think) so I cant really learn anything of how it EXACTLY works. Does anyone know of a good site cloaker that works and is cheap/free? I hear some of them can actually get you banned from google...which as you can imagine is a horrorable horrorable fate not wishable on your worst enemy........just your compettion ;-D Any suggestions/comments? Thanks, -Ryan