With 250MB a month you can either download 50,000,000 books. Or watch a couple episodes of Xena: Warrior Princess on Netflix.
Seriously though, you can't do a whole lot with 250MB a month. I learned that on my phone with my 150MB plan. You really just end up paranoid every time you use it, hoping your router is always working so it didn't kick you on 3G when you were watching a movie or something like that.