Speaking of Billy shelves, you know if they make any in solid wood, or is that a similar but different named IKEA shelf? IKEA shelving is pretty fair, but if you're going to have any significant weight on a shelf for significant periods of time, you need solid wood, even it it's pine.
I'm not knocking the billy's cause I'll probably be dropping a fair chunk of change on them when I get a house with an office/game room, but I really hope I can at least pick up wood shelves to put on the ones that will be more load bearing.