Indeed. Had we known about http://requestb.in/ before creating URI:teller we probably wouldn’t have created URI:teller in the first place. It was a great learning experience though, so no regrets there!
RequestBin seems to open source too, which is really cool. It’s also a much better choice for many scenarios, for example when you want to examine full request headers. URI:teller is more geared towards finding out where the connection came from.