Cool idea (I was almost going to make something similar myself!) but there's a couple of catches for me:<p>* Your tracked prices are only in USD, whereas I buy/sell in AUD via CoinJar.com.<p>* Apparently you're only supporting SMS within US/Canada as well? Might be good to make that clear before the signup.<p>* You have a competitor called BitcoinReminder.com who track several different currencies, a few more exchanges, and even offer alerts via Jabber / IM (as well as Email & SMS). Their site isn't as cleanly designed as yours though, and it's a paid service (whereas it seems yours is free for the moment). They've just signed up their 2000th user after 2.5 years, which might give an idea of market size.<p>But it's a neat idea & a good name for it too!