I've been using a little app called SafeSex to jot down notes securely; however it's not been maintained for ages and lacks polish. However, it does have Blowfish encryption built-in.
My question is: does anyone know of a reasonably polished alternative that supports encrypted note-taking? I'm aware of TrueCrypt, but I'd rather have a light app I could use securely on random machines without worrying about leaving copies my notes behind.