The Inq reports AGP is still strong, over 55 percent of the channel market is still AGP.
That's one of the reasons why ATI and NVIDIA are working their butt off to deliver a couple of new AGP cards like the X1300 PRO and X1600 PRO from ATI and NVIDIA's GeForce 6600 and GT plus the upcoming GeForce 7800 GS AGP and maybe a GeForce 7300 AGP too.
Higher-end AGP cards shouldn't be expected anymore and there's a quite easy philosophy behind that. Basically the manufacturers think that if you're willing to spend $649 on a new graphics card buying a new motherboard shouldn't be a problem for you.
The system integrators and OEM market however has fully switched to PCI Express. Nowadays it's nearly impossible to buy a new PC with an AGP card inside.