Hi - we are currently transitioning some major pieces of the Drop.io site, and getting API keys for accessing existing drops is, for the moment, offline.
Those keys will definitely be coming back, but if you're interested in building
drop.io's core services (upload, conversion, storage, and delivery) into a site or application you are building, you may want to take a look at our Rich Media Backbone here:
You can get an API key there, and it's free during our alpha!
Thanks, and sorry for any inconvenience,