Very useful app
Ive tried several client apps for testing web services and this one is the most friendly, most adherent to "normal" UI behavior, and stable of the lot by far and Echo is now the only client I use.
Something I would like to see is either a multiple line URI input text box or, in keeping with the header and body section design as the product stands today, a group of key/value text boxes that allow me to specify what parameters and values should be appended to the URI Ive entered.
Murrrphy about Echo