Maybe I'll do this later, but I always wanted to open up a hacker's place. I'd call it the Bit Bucket.

Part bookstore (~50 titles, classics only - W. Richard Stevens, etc.), part coffee shop, part decent hardware shop (FPGAs, GPGPU, blade servers, and half & full-height rackmounts you can convince your S.O. to let you put in the basement), and bar.

Also, a good selection of little parts that you'd normally have to ebay, a little selection of RAM, heat sinks, PCI cover plates, etc. I'd put it in a display where you'd normally see the baked goods.

I'd have no illusions of being profitable at this, but it'll give me something to do when I retire :-)