http://sandsquid.com - A web app for quickly locating and purchasing electronic parts, specifically entire BOMs (all the components on one or more PCBs, instead of just a single part like other services out there). It's bootstrapped, and we just recently launched. So far we had good traction and virtually all positive responses. Notably, people report that we save them hours every time they use our app, and I firmly…
If I may make a couple of suggestions - I put in 24 ATMEGA328P-PU-ND. It found where they were, it found the lowest price. They're $3.16 PU - total ~$76. If I get one more, 25 of them, I hit the price break, and my order total come to $50. Definitely a better deal. When I'm getting parts, the price breaks always seem to make me spend more, but there's situations where it wouldn't (like above). Adding in recognition for those would be good.
Another suggestion (this is what I was going to work on, but I've moved onto other things) - create a package deal - PCB, parts, stencils, etc, all in one. Have rolling part shipments (orders every Friday). Get reels of components, fulfill some yourself - but charge the live lowest price (you make a little bit from the reel discount, they save a little bit from your utility). You handle the money in between, and disperse it out to the lowest combined cost. Having a one stop shop where I could dump a schematic & board file and get back a PCB, parts, and stencils would be pretty awesome.