Do you like your (S)VCD movies to be stored in DVD cases? I do. Would you like to have a single DVD case per movie no matter how many CDs you have used for it? I surely do. This is how you can do it.

Take three or four regular DVD cases, cut them in half, glue them together... no, wait, this is way too lame.
Next option: There's a company that sell multiple disc DVD cases, not just the "regular" 2 disc ones but also for 3, 4, 5, 6 even 7 discs!

http://www.inetdvd.com/store/cases.asp

Haven't yet ordered anything from them so I don't know the quality of the products and service, but you may want to check it out