The issue regarding Developer Central account signup has been resolved.
Developers can click on the 'Trouble Logging In?' link (located at
http://developer.paypal.com) and request a new confirmation email. We sincerely apologize for any inconvenience this issue has caused and appreciate your patience with this matter.
If you have further questions or updates to this issue, please feel free to contact me again. To do so, please follow the response directions located near the start of this message.