Everyone needs a decent IP port forwarder, once in a while. Here are three great ones:
Thread-based, this is my most frequently used.
Async-Core - recently used when the threaded model wouldn't forward an ssh session (???)
Pinhole - another threaded implementation.
The Async-core version is clearly the hottest. It runs as slick as can be, and (at least for low-b/w) it was staggeringly quick.