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As Ween pointed out, The Strom gives you the ability to use the Blackberry SureType technology (best way to tell this: multiple letters on a single key on the keypad) or traditional Qwerty technology (a single letter, along with a number or a symbol on each key).

Thus far, the Storm is the only Blackberry that will allow you to choose between the two.

Other Blackberrys with the multiple-letter keys will be SureType, Primarily the 8100 and 8200 series) while most other Blackberry models will be Qwerty.

It took me about a week to get used to SureType, and I really don't have a strong preference either way, but you will find in if your read through some of the threds here that many have strong prefernces one way or the other.