I've always admired people who keep sketch books. It goes back to art school days where we were all encouraged to do it, though most of us failed. But there's something very compelling about looking at someone's book - it's that thing about putting up an easel outdoors and everyone passing by will almost certainly want to have a look at what you're doing.
And it's funny how when the oldest technology meets the newest, and sketch books end up on a blog, that they seem to become more compelling still (like Gwen Yip's Working Holiday in London). One of my favourites is Wil Freeborn's Ghost School - and I'd suggest you go over there now and have a look because "there’s a log just by the water at Gourock that's ideal for eating your supper on".
Don't forget what I always say when I point you to another blog: have a good poke around in the archives - that's where the treasure is buried.