It's been online a few hours and there are lots of good ideas. I really appreciate it, as it's not easy to find these things unless you pass them by on happenstance.
The Discgear looks really cool and space-efficient, but at $70/100-case it's quite the luxury. Especially considering 100 CD-R's only cost $5 nowadays.

It also worries me that they're not stackable.
The
large CD box]http://www.4goldenbridge.com/larcdstorbox.html[/L][/L] is what I have one of now, except mine is only a 50-count. It's really useful, but I found that my 50-count takes up about the same space as 50-cd cases.
I really like the Amazon.com box idea. It's cheap, it's effective... but it's not made of plastic, and that's disappointing. Also not stackable. ^_^
Anything with sleeves, including CD binders, I tend to avoid. They're generally pretty big and the 'sleeve' always turns brown or ugly after 5-ish years. I suppose it depends on the quality of the brand, but I haven't had great luck with them.
I found
this website which sells an expandable, stackable solution but uses sleeves.
I guess what I'm saying is I want something stackable, generally meaning square. It has to be compact, like something inside a 'Bag of Holding' or something that stores its contents on another plane of dimension when it's not in use. It has to be solid, long lasting, and pretty so that my girlfriend doesn't think I'm a geek. Oh, and it has to be cheap. Super cheap. Free would be good, but I've got a Lincoln in my pocket waiting to get out.
Given my current information, I'd probably stick with a spindle-Amazonbox combination until I could save up enough money for those rad-looking DiscGear-100's. The problem is that I'd have to save about $1.40 per disc to afford the DiscGear's. I burn discs in my Cendyne 40X at about 3-minutes per disc, meaning 20 discs per hour, meaning $28 per hour. Ouch. My only hope is that these cheap 'free' CD-R's will decay at a rate that makes my ability to afford such luxuries plausable (some of my CD-R's from 1998 are already curdling).
--Ed