SPB products are fantastic. I agree about the need for the finger interface. The iPhone & Blackberry Storm units alone are a huge market.
I also agree that Fitaly is the most efficient keyboard for pda's. Slides are an amazingly effective feature, especially if you have only one entry on a particular slide direction. I put multiple entries in the North direction only and put the items that I use over and over by themselves on other compass directions. That way, I just slide and it gets the word or phrase without having to pick off a list. Fast. Very fast. Words like the, that, with, which, what, school, board, education (I work with schools). Components like ing, ation or ed. Just flick the stylus on a letter. Be judicious with what you put on them and you can really fly. Amazing tool, this Fitaly. I have my IT department trying to get me to switch to a Blackberry but I tell them that it ain't happening without Fitaly!!