EV-DO question ...
Yes. Once EV-DO becomes available you will know just by looking at the main display on your phone. Depending on what version of the Verizon User Interface you have, it will either say EV or will have EV followed by 1-4 bars of signal.
Once you see that your phone is recieving EV-DO, you will have to call Verizon customer service at 611 to have them activate V-CAST.
As far as I know you cant activate the V-CAST function from the phone or the internet. Once V-CAST is activated, your phone will begine to download drivers and the software needed to run the V-CAST service.
Hope that helps.