How to get certified on-line:

http://www.aquastrophics.com/corresfaq.html

"What agency is the certification?
The Academic portion of the scuba course and it's certification works for ANY scuba certification agency.
When you go on vacation to any resort in the entire world, you can present your certificate of completion and by-pass the "book work" and go straight to the pool or open water. We include a "Scuba Referral Form" and all other necessary paperwork to complete your certification. The "instructor of record" (the instructor that takes you into open water and issues your certification card) may want you to take a quiz, exam, or complete a verbal quiz to test your knowledge. They may want you to watch a video or two. But you won't be required to waste valuable vacation time sitting though the classroom portion of scuba diving. The certification agency will be the agency of which the instructor of record is a member."

Try taking it to GUE ;-)