I came here to post the same question pretty much...
I'm definitely getting it. The main reason being that there are a lot of times I turn off my monitor at night, turn off all my lights, get in bed, get comfortable, only to realize I forgot to check ONE thing I was curious about on IMDB/Wikipedia/whatever... then I can't fall asleep unless I get out of bed and go look cuz the one nagging thought of feeling like I HAVE to go see. Now I'll be able to just reach over and pull up whatever it is on my DS. I think it might be a little less usefull for anybody who owns a notebook computer, but even then, depending on what you think of spending $35 or whatever you plan on using the browser for, the DS most likely won't take as long to start up and get to wherever you need to go as opposed to starting up a notebook from bed or wherever.
I guess it's just a lot of little things that way, but I'm wondering what its capabilities will be. If it's just like the Wii one, that'll be plenty enough for me. I don't need to have too much in it. Even Flash would make me happier than I'm expecting to be. Bottom line, it's one payment of $35 to never have to get out of bed just after going to bed every damn night.
Oh and not to mention Mondays when I sleep in and just wake up for a second around VC update time and curiosity keeps me awake haha