Most sites that have Gears support don't force the user to install Gears to use the site. There is no pop-up telling the users that they should get Gears to ru

Most sites that have Gears support don't force the user to install Gears to use the site. There is no pop-up telling the users that they should get Gears to run the site - Google docs just has a nice little link at the top that says "Offline". There is no impetus to click it, and I bet many users don't even realize this feature exists. When the plug-in becomes required to use a site, and the user is presented with a pop-up telling him so, I think that changes things quite a bit.