Oh, is the 5Gb cap fairly new? Does Verizon have a data cap? Reason I ask is I plan to make the switch to Sprint from Verizon when the EVO is finally released.
EDIT: Found this info on Data plans -
Misconceptions of unlimited data plans
EDIT 2: Upon further research, I'm finding that caps are placed on Air Cards, not on Smartphone data usage. Please know, this is all hearsay from people on the internet. If you want to be certain, check your contracts terms & conditions.