I just posted a bit about Google Website Optimizer, and potential SEO issues. It appears I may be guilty of FUD* mongering. Lest I be tagged as such:
Robert Gorell at FutureNowInc.com says it’s very, very unlikely that use of the tool would lead to penalties from Google.
I’m still less sure about Yahoo – look for follow-up info in the coming weeks.
* Fear, Uncertainty, Doubt