I've also got a shelf for my atypical fabrics - my linens and flannels and such, as well as a pile of voile, which I never put on the boards (too slippery) and some small pieces of my favorite fabric collection ever, Wonderland, from when I first started sewing.
For my scraps and fat quarters, I keep them in bins, which I've moved to my sewing studio's closet, in an effort to keep the floor a little bit emptier. I have a bin for every color, with the color name on the side, as well as an unsorted bin, for those scraps that I haven't put away just yet. I used to keep the bins stacked up high, which made accessing my scraps a bit frustrating - unstacking and restocking and all that - so this new cube shelving system allows each bin to sit independent of the others, so I can get to just one at any given point in time, which is going to make scrap busting much, much easier!
Back on the shelves in my sewing studio, I keep my mammoth stash of 505 basting spray as well as my Best Press. I've got some of the new Flatter spray on its way to me right now, too, and I'm excited to try it out. I'm also repurposing some nifty Lego containers from the Lego Store to hold my Aurifloss and Cosmo floss. They look awfully pretty in those containers, and I love getting to reuse them!