"Thank you for the help. I have been pleased with echomtg and the ease of use; it's been a great resource. As far as future use, I am actually in the market to sell my 15-20 year old collection and wanted to find a resource for cataloging my collection and finding an estimated value. Echomtg has been the best that I have found. Thank you again for your help." — Craig
Echo is an SaaS application for tracking Magic:the Gathering card collections. It was developed as a project to handle heavy trading towards building a powered cube. At the time of writing this, Echo has over 1500 users, and is growing 5-10 users a day.
Have fun ;)