After I choose a collection of fabric from my stash for a quilt I make a photo copy of the pattern I will be making; this is my working pattern and I will make notes and changes on this copy, and on a seperate piece of copy paper I line up 2" sqs of each of the fabric and sew baste them to the paper with one seam. I write any info from the selvage next to each swatch and where in the pattern it will be used, like star points, sashing, binding, etc. I always have a reference to look at. If I decide to change a fabric I just sew the new choice swatch right over the original and it gives me a history.
I also take this paper to LQS when shopping for coordinating fabrics. Easy-peezy!
EDIT: I take a picture of the top before and and after quilting and binding. These go into a binder with the pattern and fabric swatches with dates, start and finish and who it was given to.