As far as keeping track of everything in one place, Evernote (
http://evernote.com/evernote/) has been a great help to me. It's free up to 60MB of upload per month, and it syncs copies of everything on my computer and online. One of its greatest strengths is that it performs OCR on images, making all the text in them searchable.
So: I make a new note for a project. I tag it "amp", "SE", etc. Then I use web clipper to copy-and-paste forum posts and other info into the note, including images. I drag in mp3s sound clips of similar amps. If I like a paragraph in a book, I can take a picture of it with my phone, and it uploads to Evernote, performs OCR on the image, and makes that text searchable. I drag in any relevant data sheets in PDF or image formats. As I revise a schematic, I drag in each version of the SCH file and it links to the file - with a click, I can open it in JSchem.
Then I can just search for "6L6", and every occurrence in every image or text note is brought up. If you use the premium version it even makes PDFs searchable.
If my computer crashes, no problem, all that stuff is saved in the cloud. If I want to share my entire library of info on that amp with someone, no problem, just send them a link the note.
It's definitely worth checking out.