Web app Niggle It is a great way to keep track of warranties and other vital documents with an expiry date. You can now get even more out of the service with a special deal for Lifehacker readers.
Just hit the page below to sign up, and you'll get ten free 'niggles' with the service, instead of the usual five. If you need more than that, the basic plan is $24.95 a year. And check out the iPhone app for easily uploading pictures and other data associated with each niggle.