I remember a sales person trying to get us interested in paid services relating to WAP. My thoughts at the time was that it was pointless - mobiles would get better and better to the point where people could start using them in a similar way to PCs.
While we're not quite there yet (in my opinion), we getting closer and closer.
My ultimate device would be a mobile phone similar to existing ones on the market today - compact enough to fit into my pocket, with a screen 4" or thereabouts that's good enough to use for most mobile tasks I need to do.
Then, when I want to buy something or do some serious form filling (or watch some TV/view photos) I want to be able to shake it slightly - and out pops a much larger screen for my convenience. Once we get to flip out screens I think I'll be happy (and fast downloading/uploading when mobile)!