NOTE: This post was originally made on the same date in 2005, not 2006.
I recently presented at the interz0ne 4 conference in Atlanta on a topic entitled "Disposable Email Vulnerabilities". During this presentation, I announced the latest DDP project to go live.
You can download the actual presentation here which explains it better, but the short version is that this system cannot be backdoored as easily as the others. You can feel safe using this to avoid SPAM and protect your privacy and you don't have to go through the hassle of creating another hotmail or gmail account and filling out all of that personal information.
As for the unusual URL, it was actually a site that we registered as a joke a while back. We thought it a funny name and we registered it as a ".biz" simply because .biz domains were only 4.95 per year at that time. We were using this site simply as a sandbox to test things and decided it would be good to use for this project.