Well... just looking around I came across this article on Cnet and found it pretty interesting. Apparently Nokia has come up with some software that they say can double the speed of EDGE.
Should be ready in 3rd quarter of 2008
source
On average iPhone users report that they can get download speeds of 210 kbps. Nokia Siemens says that with a simple software upgrade to the EDGE network equipment, operators, like AT&T, can offer their customers download speeds of 592 kilobits per second.
Should be ready in 3rd quarter of 2008
source