From Freshmeat today, this might interest some of us:
Charles is a Web debugging tool, HTTP monitor, and reverse HTTP proxy for Web developers that includes plain text debugging of HTTPS/SSL. It is built in Java Swing, and runs on all Java platforms. It is an HTTP proxy server that displays requests and responses, complete with HTTP headers. This enables the developer to examine the exact content of HTTP exchanges, including cookies, caching, and redirects. It can also throttle your connection in order to simulate modem conditions.
Changes: This version features SSL proxy support that allows users to debug SSL communications in plain text, and HTTP/1.1 support.
Here's the link:
http://freshmeat.net/releases/129697/