Ask lj: android apps

I'm kind of behind the times when it comes to cell phones. I'm hoping to get a nice shiny new one in the near future, but the features I want seem to greatly limit my choices. I know that andriod is getting a lot of nice apps, but the service I use has no data. Do all andriod apps require data? or are there some cool tools that work off line? IE, is someone who has no data plan just not care about the andriod OS?