I have a 17" PB although mine looks like the day it was assembled (except the stupid latch which was never very durable to begin with) and I have all the original boxes, cords, etc. I have a soft spot for this computer as I lost my "Mac virginity" with it.
What I have found though is that the backlight is starting to get weak. Is it worthwhile to replace the LCD panel or should I finally bite the bullet and buy a new MacBook Pro? Even if a good LCD panel is $300, it still seems cost-beneficial to replace the LCD and hang on to it for a few more years. I suppose there's a bunch of new software I am missing out on, but my PB works just fine - syncs with my iPad wonderfully too. It truly has been a flawless machine, even with the Leopard upgrade.
Probably like other PowerPC owners on here, it is nice to have something that works so well, all the time, with no worries. I have faint memories of Dell laptops with build qualities similar to a 1970s American car, and I don't ever want to risk having to go through that again.