Clearing Cache, or How to Get a Page to Reload…

I’m having some trouble with getting WordPress to reload a page so that it shows updates. I’m assuming it’s a WordPress problem and not a browser problem because I’ve experimented with Camino, Safari and Firefox (Mac OS X) and I run into the same problem on all 3. The problem is that even if I empty the browser cache, I still don’t see any updates to a page that I had previously loaded. Even if I quit out of the browser and restart, I still see the old version of the page. Eventually the page will update although it seem to happen after some amount of time. To view any changed I have made to the sidebar or layout, I have to go to a page that I haven’t viewed yet. Anybody know how I can fix this? Does it have something to do with WPCache? (I’m afraid to mess around with that because I’m not sure what I’m doing.)

Thanks
Chris