This Joey Junior Purse Mate Purse Organizer, $20 for leather; $25 for suede, is definitely worth checking out, especially if you're a slave to your purse like I am. No matter how much of a clean freak you are, things tend to get lost in a large bag. That's where this purse organizer comes in handy. Separate your goods in pockets, as shown, and watch how easy it'll be to find your cell phone the next time it rings.
If you're into small bags and don't have a lot of stuff, the Mini Purse Organizer, $15, is another option.