PartBolt

PartBolt makes it easy for you to track and organize electronic components. You’ll know exactly what you have and where it is. In addition, you can track projects that you create with your parts, meaning that you'll know what parts are being used where. Plus, you'll never accidentally buy something you already have.

It's also got lot control---that means it lets you track an individual lot of parts. That way, you can trace components you've used all the way back to where you got them from.

In short: you'll spend less time finding stuff and more time on actual projects!