Hi, A bucket of ideas on simple, mostly unpractical while very spectacular applications for Maemo5/N900. Examples for studying how to use accelerometer data from an application. PetrSU has generated several ideas, feel free to comment them, use and expand.
[*]A user constructs an unstable unbalanced object on the screen, e.g., composed from many pieces or liquid elements appear. Then she tries to walk keeping the balance. The more distance, the better. The application becomes to seem very practical when you start offering this competition on parties, weddings, and other funny events. Potentially in future, large deliveries to state police would take a place (alcohol tests).[/*:m]
[*]A user works with her email client and sees a lot of "SPAM" messages in her INBOX, mixed with regular messages. Note that is typical when a SPAM filter marks suspicious messages with the SPAM prefix. Then the user simply shakes the device (a special scenario of shaking movements can be implemented if needed), and ... all SPAM messages are moved into SPAMBOX![/*:m]
[*]There exists an application that measure the distance that N900 spends in air being thrown up. Ok, can you implement an application that sends SMS (or other communication units) to a fixed master device during the fly? The more messages have sent the better is the player. Yet another application for funny competitions at parties.[/*:m][/list:u]
More ideas you can find in project "Sensors" at http://oss.fruct.org/wiki/.