I have heard writing coaches encourage their students to commit to writing in a journal every day to improve their writing skills. I am not sure this is what they had in mind. But, if you love Twitter and love to record your day in tiny bites, check out Memiary. Sign up for the service and then begin entering five events in your day in short Twitter-esqe style. Then, at a later time, search by day or show entries for set periods of time. Instant diary, no tiny key combination required.