AGP... Express?

USB

ISA or some form of Microchannel.

28K modem

PCI-E I believe, won't be phased out in several years really, it's likely to get a 32x and 64x rating eventually, sure to last a while.

If anything, I believe integrated into the CPU may be a next step, even for hardcore systems...

Some sort of ultimate all in one chip will eventually dawn, though, where you no longer need to upgrade, since it can render Real Life in full FPS connected to an USB cable into your brain =)

LOL! AGP-Express is the name ECS is using for a PCI bus connected to an AGP slot on a PCI-Express chipset. It provides the old (circa 1996) PCI performance, it's not even as fast as AGP2x.

Graphics Lead Accelerated Data - G.L.A.D. , and it can be used as 1X or up to about 50X, although there's no fixed limit IIRC very flexible connector.

It's actually and interesting connector that ties all the formats together, individual wire interconnects, extensive shielding very flexible, and it's so simple it's kinda old school, I'm sure some members here will be familiar with it's design in their past work, here's a pic from a big supporter/distributor;

http://www.chiswick.ca//images/product/Full/ch136.jpg

Comes in multi-colour options for the moding community too, pretty cool. 8)

LOL