Most parts I get are ordered online anymore, even stuff from Advance Auto (save a fortune with discount codes). Since all these places email an invoice I just create a folder in my email, like hotmail, gmail, whatever, and name it whatever truck the receipts go to, like "Dad's Truck", "Mud Truck", "GMC Sierra" and move the invoices to the respective folders. Makes it a cinch to take care of warranty items or get a running total of your resto to date.
Cell phone cameras are the greatest thing to happen in ages. You can take before/after photos, photos of things that need attention, you can even shove you phone up behind the dash or some other place hard to see and snap pics or video to see what the hell you can't see.
Making folders on your computer is a good way to sort pics too. Word documents listing things you want to do helps keep you on track and helps you organize priorities. But honestly for me they can be uninteresting and easy to forget. If you have Microsoft Word, or even Mozilla Open Office, you can create a simple webpage using a WYSIWYG (what you see is what you get) html editor. Drag-and-drop, put this here, move that there. Then through your internet service provider (or a million free services) upload it to the net. You get more out of it when you can see it in a format like that. Then when you make changes to add to it, just use your editor and upload the new version. I never thought I could do something like that till I started tinkering with it. Or even a slideshow in a video format uploaded to youtube. It gives you (and others) a more rich experience of the transformation and all the work you put into it.
