This week's book giveaway is in the Agile and other Processes forum. We're giving away four copies of The Mikado Method and have Ola Ellnestam and Daniel Brolund on-line! See this thread for details.
If the goal is to pass parameters via a link there aren't too many options: put them in the URL, have them already in session, or possibly use Ajax depending on your requirements. If you use Ajax they'll still be visible if the user is using a proxy, Firebug, etc.