Ivy Mike
Scholar
I'm sure there are some regulars old enough to remember the classic Lone Wolf gamebook series from Joe Dever. I played/read the hell out of several of them back in the day. Now, it's time to do it again on your DS. Project Aon's Frederic whatshisname has made a portable version of the first book, including inventory management and a random number generator. I blew through it today and it struck me what a fantastic idea this is for a portable console such as the DS - I'm sincerely hoping he decides to release further books.
If you need further convincing, here's screenshots and a video of it in action.
If you need further convincing, here's screenshots and a video of it in action.