I usually don't go more complex than making myself checklists or Bills-of-Materials to keep track of what I have on hand, what I have to order, where to order it from, necessary part #'s like expected delivery times, and things like that.
I like to use GoogleDocs (now called Drive I believe) because I can get to my checklists from my phone, computer in my shop, at work, at home, etc. I can also add my brother or team-mates as being allowed to edit the document to cross things off as they complete them even if I don't know it's happened yet.
My current spreadsheet for the yellow race car.
This link you should all be able to view, but not edit. Also a handy feature.
What kinds of things do you guys do to keep on track and make sure you have what you need, when you need it?
![Image](https://lh6.googleusercontent.com/-kzeaY0AcR6U/UZ5QbWQGw2I/AAAAAAAANIA/HmqNifsLrjA/s990/99_spreadsheet.jpg)