don't buy the n900!

ive bought it and its a fantastic phone, its the best piece of tech ive ever owned, but its difficult to use and to get familiar with it. its not for everybody: linux, opensourceness, lack of shiny shitty unuseful costly apps, then it has flash support, a camera, multitasking (way too difficult for you: it means you could do more than one thing AT THE SAME TIME!)
see, just too much for people that make such questions as yours. its more a thing for nerdy geeks with more than 70 as I.Q.

go buy an iphone 3gs instead. or better, wait for the ipad.