Sprint has brought their EV-DO Revision A network upgrades to three more cities: Las Vegas, Milwaukee and Seattle. Twenty-one cities will be upgraded before the end of the year. From the horse's mouth:

"Seattle is among the first 21 markets where Sprint will roll out EV-DO Revision A this year with coverage expected to reach more than 40 million people. Sprint Power Vision users in these markets should experience significantly faster average upload speeds of 300-400 kbps (compared with 50-70 kbps of current EV-DO networks). Average download speeds should also increase to 450–800 kbps from 400-700 kbps."

While the faster speeds are obviously nice, the real benefit to Revision A is the significantly reduced latency, which in upgraded markets should be somewhere around 50ms. Many first generation EVDO users report a latency range of 200ms to 500ms, even higher in saturated markets.

We recently compared EVDO service from Verizon Wireless and Sprint. We gave the current competitive edge to Sprint because of faster Revision A adoption and a less restrictive EULA.