WP7 - have it & deployment

short: Got a Windows Phone, which is frighteningly fun to use and almost addictive.
And i realized that Microsoft has spun a pretty impressing web of social websites, all accessible with a Live Id. I am sure their servers will hit bottlenecks, and usage of MS sites raise quite a bit.
Deployment is tricky. nicely guided by several MS tools and sites, but do I really need to send in a physical tax declaration form to MS before I can test-deploy my App ?
Phew...