This is a great thing! Sometimes for price alerts I go to bitcoinwisdom and often i forget that I closed the tab for it; it is about damn time that there are price alerts that are desktop based, what exchanges are u planning to add? all of them? what about altcoins?
You can make suggestions which exchange you want me to add.
Maybe some popular altcoins coming soon after i finished the bitcoin version. After that the source is published and you can add your own.