Hey,
I was wondering who cache's their content, also what section / catagories / modules do you cache?
I can understand the rss synd stuff needing to be cached, but what other reasons would you implement caching on your site?
It's hard to say definitively as it depends on the configuration of your site, which modules, how many, how much content, how many menu items, sef on/off, it can all make huge variations. In general you should have approx 50% less queries, so that can translate into quite a speed increase.