I've tried for years to take good notes when I print in the darkroom. I'm dyslexic and I have horrible handwriting and typing is the only saving grace for note taking. I use an Ipad for note taking for various aspects of my life including shopping list, saving recipes and the list goes on. I'm a big fan of Evernote. It works on my computer and Ipad and will sync between devices. There's also Skitch, a cousin of Evernote that will let you doodle with your finger on your tablet and make notes on photos. Here's a sample.
The cool thing is that it's synced into the cloud and I can search for the note. Being horribly disorganized and tend to lose paper, I'll probably stick with this.