I don't usually by stuff like this but I knew if I had a psp, I'd use it. I just never got one before... I take the bus to and from work to save myself from driving my car in traffic and it's relaxing to just chill out before and after work... Not to mention saving money on gas. So I either use my minidisc player, took a nap, or played gameboy. Now that I have a PSP, it replaced the gameboy. If I ever felt my minidisc player was obsolete, I'd get an Ipod. PSP does music too but I'd rather not take up my 1gig of space with music when I have my MD player...
Being able to watch videos, play music, and games is definately something I like about the PSP. If I was driving to work still, I'd probably never use it. I've had MD players since they came out(they were 400 bucks then... It was an x-mas gift). I don't see myself replacing it anytime soon since it's small and holds all the music I'll ever need with re-recorded ability.
Same deal with my MD player. I use it all the time at school walking to class, to the parking lot, or at the library studying.
Ok, that was kinda longwinded.
cliffs: Sony portable products ftw