Yes, I keep a record book of the quilts I have made. I've only made 3 so far though.
My SIL is the one who got me excited about quilting, the last week of November. She told me to start a log as she was sorry she didn't start one until later.
I write in my journal the following along with a picture of the quilt: (although after seeing yours I may add more!)
Title/Name:
Started Date:
Completed Date:
Pattern:
Created For:
Lessons Learned:
Notes:
I also keep a spreadsheet of my stash 1/2 yard and larger. That way if I need a particular piece of material I can check it out on my spreadsheet.
I also did the same with my books and magazines. This has helped me easily check for magazines when people are looking for them to complete a pattern. If I don't plan on using the magazine, I just send it to them.
I love to pay it forward.