Email to you from your ground check in your fridge?
Rafe Needleman writes about Cypak, a company that has the technology to mount its tiny microprocessor on paper or inside a credit card etc. in this Business 2.0 story:
Computer chips keep getting cheaper, so we see them in increasingly unlikely places: embedded in credit cards, playing off-key birthday tunes in greeting cards, and so forth. The era of truly cheap -- i.e., almost free -- chips isn't yet upon us, though, and thus some fantasy applications, like meat packaging that e-mails you from the fridge when the ground chuck is starting to spoil, aren't economically feasible. But there's an interesting Swedish company that's bringing us closer.