Ok, first post, I'll try not to sound stupid.

I have been accessing the internet through a random proxy (googled and browsed the proxy sites for a while). My question is concerning the security of my information. I frequently use online banking (haven't since I set up the proxy), and similar ecommerce (ebay, paypal, etc.). I'm sure that the admins running the proxy can access any http I view, but couldn't they also have my banking and other information (from a secure site) sitting in their cache to be found and exploited?

Thanks for the advice, and I look forward to learning a lot from all of you.

-jhp