Like you, I had great intentions too. I bought a spiral bound book in the scrapbooking section of Michael's with blank pages. I was really good to start with and I wrote about my quilts, added pics and pieces of fabric. I wrote about what inspired me to make a particular quilt, why I picked the fabrics I did, who the quilt was made for, etc. That worked for about a year or so.
Since then I have not made the time to get back to my journal. Instead I have a list of quilts I finished, the size, and the date finished. I take pictures of my quilts and they are on my computer. It is my hope to someday take the time to go back and continue my quilt journal.
It is so fun to get out my journal and share it with friends and family. I need to bring it up to date.
Find a way to record your quilts that works for you. Keeping a record of your quilting is your legacy for future generations.