I recently created a website for IEWatch Software LLC. www.iewatch.com - the creators of IEWatch, a cool little addin for IE. As a beta tester, I was offered a copy of the software. Initially I kept thinking, okay, might be useful in SOME situations, but why would I waste a hundred bucks on this app.
And for the first week or two I used it, I seriosly did not think it would ever be useful for me. While I was working on another project (an ecommerce asp.net 2.0 app), I kept running into a problem where the payment processor kept returning blank values. The usual debug features were not helping, and with the 48 hour deadline approaching, I was starting to panic. This is where I finally got to REALLY use IEWatch. The data being posted by the payment processor was encrypted, but IEWatch was able to quickly help me capture the data, see where my code was wrong (Hey, even *I* make mistakes, y'know!) and thankfully made the deadline.
I highly recommend anyone working with web apps to try this baby out. Hop on over to http://www.iewatch.com and try the demo. And no, I was not paid for this endorsement. It is genuine. 