I was reading a billboard in Winnipeg yesterday and it appears that MTS will be introducing an unlimited data & email plan for specific BlackBerry devices (I only recall seeing the BlackBerry Pearl but I'm sure there are other phones compatible as well) for $40/month, MTS hasn't updated their website for the promo yet. But that's not a bad price for Unlimited Data for a cellphone, however Telus offers the same in Winnipeg for $30, and Rogers offers 6GB for $30 as well (sure isn't unlimited but it's better than their old offerings).
Also they appear to have a new Student plan out now, pretty good deal, unlimited text, 250 daytime and unlimited evenings at 5 and weekends for $19.99/month. Not a bad deal:
http://www.mts.ca/portal/site/mts/menuitem.a275cbc6dbb0d4e50e14081031248a0c/?vgnextoid=506be8cf49c1d010VgnVCM1000000408120aRCRD&vgnextchannel=43cb0d9368e56110VgnVCM1000000408120aRCRD§ion=1