Actually, BIS polls for emails every 15minutes, so it is basically the same as the iphone.
The only exception is yahoo which is instant and gmail is more like near instant.
This is for other email addresses obviously, the @carrier.blackberry address is instant.
But it isnt recommended for use.
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."