I started keeping a sketchbook/idea notebook at the beginning of last month, and I don't know why the heck I didn't do it sooner. It's a huge 5-subject notebook with dividers and pockets and it's great for those ideas that swim around in my head and then disappear! You know the ones...they usually invade your brain right before you fall asleep?
I don't draw very well unless it's a design element or something abstract (maybe that's why I never kept one?), but I quickly realized that it doesn't matter.
It's proven to be a nice resource and as long as I can decipher what I've written and drawn, I'm good. =) I use it for sketching any ideas I have for new nature scenes to create, general doodling, photo set-up ideas...I almost can't live without it now, and recently got another smaller one to keep with me all the time. Pardon the yucky photo quality ...still getting used to the new camera!
Do you keep a book like this? Why or why not? If you do, what kinds of things do you put in it?