While common gear-head products include red-light-camera locators like Speedchetah, and cop location sharing gizmos like Trapster, one Memphis company is hoping to cash in on just obeying the law. Announced at SEMA next week is the Speederaser, a simple device to mark where all the speed limit signs are located. Its linked to the open source speed limit database Wikispeedia. Once setup, your cruise will adjust to the speed limit of all things. For the dangerous minded, there is a speed-tolerance setting which goes to 11.