My friend and I built a thing that alerted me when my dryer was done, called Toasty Knickers. We hooked up the dryer to an Arduino. Our first attempt was Arduino->wifi->email->IFTTT->SMS but it was pretty flaky. We finally got it down to Arduino->wifi->Pushover. It worked out really well!
https://www.dropbox.com/s/xd1zputlwz10d72/2012-12-19%2000.57...