Monitor For Me (http://monitorfor.me, clickable in comments) is a service I built from my own need for it -- a simple, affordable app that will listen for my smoke detector to go off and send me an SMS message (or email) to let me know.
It also uploads a 5 second audio sample so I can listen to what triggered the alert, and I can request more samples at will to "check in."
brudgers mentioned that receiving a text message (as opposed to a phone call going out to police and/or fire) is not necessarily the first thing he'd want to see happen. I can certainly appreciate the sentiment -- you want instant response in a situation like this. My personal preference, though, is to make the judgement call myself (and avoid costly false alarms). If everyone else disagrees with me, well, I suppose I'll need to retool the idea, but that's what I want to figure out.
Also: I'm no designer. I tried to keep a simple, clean aesthetic, but if it's just plain unusable, please let me know.
I look forward to your feedback on any part of this: design, idea in general, usability, etc.
Thanks, John
Site: http://monitorfor.me
Invite Code: HNFTW (free 7 day subscription)