Phidgets I/O device with internal and external temperature sensors persisted to a MySQL db hosted on a linux server. See: http://www.jeffa.org/~jeffa/ePhidgetY/
wp7 application reads xml from ePhidgetY
http://www.xapfest.com/apps/details/ephidgety
http://www.windowsphone.com/en-US/apps/47d10ba5-2e9a-e011-986b-78e7d1fa76f8