Man, I'm going through a fairly similar thing as you tsurara-san...y'know, expect the commute and the plane trip.
As for me, my DS is my friend as well. I just cant seem to commit and sit down in front of the TV and play the PS2, GC, nor my Xbox anymore. I have a HUGE stack of games building up for the last year that I've barely touched. (Nearly 40 game titles I barely touched...thats what happens when you work in a game shop and abuse your discount along with sales!!) Now the DS, I can take that anywhere!! The ride over to the relatives, sitting through a blackout, and so on. Another thing that makes the DS superior over the home consoles is the fact that its not region specific!! I can play imported or store bought JP games with no problem!!!
If I can get financially secure again I'd also like to invest into a PSP...so many games that I'd like on it. (=w=)