IS one of your clients running into issues with a site you built for them? Instead od asking them a bunch of questions, point them to this site and have them e-mail you quickly e-mail you key browser/platform information. I wish this existed when I was doing client work.
This is slick, and falls into the “I can’t believe it didn’t already exist” category. “Showoff is a service that allows a locally run server on any port to be accesible on the public Internet. It creates a public URL for a server on localhost that you can share with anyone. All requests to that url are tunneled to your workstation.”