Have you been looking for a web-based service that will do rot13 encoding? For free? Well look no more! Visit rot13.com now and you will quickly be able to decode rot13'ified text, such as this excellent 80's movie quote, "lbhe zbzzn jnf n fabjoybjre".

And if you use vim, you can use the build-in rot13 support by typing g?? to encode/decode the current line.