One problem I have pretty much constantly is that I have way too many needles -- particularly double-points and circulars -- and I have yet to come up with a good way to store and organize them. Right now I have a whole filing cabinet drawer dedicated to needles and crochet hooks, and it's a perpetual mess. In addition to that, there's a basket on my desk that has all the random DPNs I've found here and there (my daughter loves to play with them) that have yet to make it back to the drawer.
I have a needle roll, but I'm really bad about not putting things away after I use them. So my storage solution really needs to include someone who will put things back where they go when I'm done!
Unfortunately, the Crafter's Tool Butler by Jordana Paige is not a real butler; it can't help me with my picking-up issues. But it is a big, roomy storage pouch with room for a bunch of DPNs, circulars and other knitting tools. (There's no such tool that's big enough for my whole stash, but for a normal knitter this would probably provide plenty of storage space.)
It has six flat pockets for DPNs and four zippered mesh pockets for circulars, which also have spots for labels so you don't have to dig into the pouches to see what's in there. There's also a needle inventory so you'll know exactly what you stored inside.
I think this bag is probably too big for most people to want to carry around with them, but as a storage solution that gets a lot of needles into a compact space, it's a great choice.