www.safeweb.com Free. Encrypts all data coming from website, but does not obscure URLs in requests. Pretty fast. Lots of configurable options for cookies, etc.

Too bad it doesn't work at all: Your browser sent a request that this server could not understand. Invalid URI in request GET /?placetogo=www.yahoo.com HTTP/1.0 Apache/1.3.12 Server at www.safeweb.com Port 443