About a year or so ago, I stumbled across some blog entries by Chase Jarvis and others on Chase's Best Camera book, which is a book of images taken with his iPhone. The concept really intrigued me which revolves around the fact that the best camera is the one you have with you. Chase takes an insane about of images with his iPhone on a weekly basis, obviously enough to develop a book of images from it. If I remember correctly, over several thousand. Read more about it here: http://blog.chasejarvis.com/blog/2009/09/the-best-camera-iphone-app-book-community/
Personally, keeping some type of camera around most of the time has allowed me to take many photographs that I would never have gotten and also keeps me focused on finding new things to shoot. Give it a try for a month or so and let me know what you think.