[PlanetFunk]

I wrote a jetpack app the allows you to toggle the Search header, Left Column, and Footer elements on/off in iGoogle.

http://jetpackgallery.mozillalabs.com/jetpacks/55

I'd say it didn't take off because it requires the user to have firefox, install jetpack, use igoogle, and be annoyed by all that wasted space etc :)

I wouldn't say it failed. I use it at work and home, and I love it :)