Good example of web based validator tool

The Watchfire WebExact tool is a really good example of a web based validation tool. There are lots of good ideas here which could be copied in version 2 of the DELI validator. I also like the clever way they limit the number of times you can access the validator, so you can try it but for heavy usage you have to buy it. This is an interesting commercial approach.

The other nice thing is it is very educational, so you end up learning a lot in the process of using the tool. With UAProf, it would be really useful to have a tool that did this.