I personally hate caches. I use about ten web pages frequently, and when I go to them I want a fresh copy more than I want a fast copy. While I havn't use it, I doubt it would save that much time, especially considering my open-tab-in-background habbit.

The only time I'd really like something of the sort is when I'm on a god foresaken GPRS connection and would love a nice compression proxy to make things slightly less painful. Of course, this hasn't been an issue since tmobile cut off free gprs.

Matthew