So the Google Web Accelerator is back and twice as lethal as before….

More interesting for most applications, especially those already requiring Javascript to do Ajax, is the addition of :post => true to link_to.
This will add a onclick attribute on the ahref, which generates a
dynamic, invisible form that again turns the GET into a POST.

How Rails is prepared for GWA II: Vengeance (Loud Thinking)

It’s nice to use a framework that handles the issue at all, let alone with a couple of elegant solutions. If you have any links (href=) in your app that alter the state of your database (deletes, especially) be sure to read up on this.