Help me identify this leak and I'll be your best friend...

[DieselHead]

Well, after battling a rust hole that was causing a leak that resulted in water accumulating in the rear footwell behind the driver's seat, I now have a new water leak. The pic shows where the water is dripping. It's also accumulating in the same place on the other side. Can anyone tell me where this is coming from? Sunroof area? Rear windshield seal? Argh!!! I hate all these water leaks. It's been raining a lot here recently and I've been quite concerned. Thanks a million times over.

Alex