I will make some regular postings in here over the next few days as time permits, if you have any specific questions, feel free to ask.
Although EVDO itself is not being rolled out everywhere straightaway, other T3G servcies are - i.e. in -any- 027 coverage you will still be able to video message, video stream and push to talk.
EVDOs latency is less than 200ms (GPRS can be 2 - 5 seconds on a bad day), so EVDO is great for Citrix sessions.
Data Session Handovers -
EVDO - 1x 2 - 3 second pause, then full resume at the lower speed
1x - EVDO - no delay, stay on 1x till your connection goes dormant or you reconnect, then you will be on EVDO.