The agreements were variously related to active recruiting (don't cold-call employees of X), passive recruiting (don't hire employees of X), and active retribution for exploring career options (if you at company Y learn of any employees of X seeking jobs at Y, notify management at X). See http://www.hightechemployeelawsuit.com/case-documents.aspx for details about which companies made which commitments.

Nope. Someone at Google also was let go because they hired someone from Apple who came of their own volition.