TMobile's new plan kind of displaces it. You automatically get unlimited throttled data. You can top them off with high speed passes as follows:
100MB for a day for $15
200MB for a week for $25
500MB for two weeks for $50
I am not sure if you can buy multiple passes in the same month. I suppose if you were going to Europe for a month at a time, it might be a better deal to go with Open Europe, but the ability to bolt these on as needed make more sense.
Here is a Howard's forum on the subject:
http://www.howardforums.com/showthre...en-Europe-Plan