Multi-Site SEO using Host Headers

[HunterW]

Hi - I'm working on a proposal for a client who runs  3 different career websites.  He uses "host headers" to direct the website visitor to the correct website.  For example, if the visitor comes from Washington he goes to one url.  If he is in Kansas, he goes to another URL.

Does anyone have any experience doing SEO with this type of system?  What do I need to know?  What are hurdles I'll encounter?

Thanks,

-Hunter

[TakeshiYoung]

Sounds like there could be some potential cloaking or indexation issues. Which version of the site does Google see?

[HunterW]

It sees all 3 versions.  Each URL has some unique content and a unique look.