I've kept the packaging from my Powerbook, but it's not in very good condition. Used it to pack some stuff when I moved back home. It's ripped and covered with brown tape
I keep my ibook packaging, it holds my ibook stuff like the manual, CDs, and it keeps it orgainized. also it's pretty good at showing off the stuff that i have. it's nearly like a Trophy for me
I've got my PowerBook, iPod, iSight, mouse, and AirPort boxes stacked in my closet. I'm also using the boxes for OS X Panther and OS X Tiger as book ends. To give them a little weight I dropped in a ziploc full of sand in each. They look amazingly good if you ask me.
I will buy an iBook + Airport Express in the USA at the end of the year and unfortunately I will have to throw away all the boxes for I can pass by the Brazilian Customs without problems.