Here's a series of tutorials and example applications for Windows Phone 7 based on the "31 days of Apps" built by the guys at apps amuck. I find I learn better by building real applications and the series at AppsAmuck was great inspiration. Rather than your standard tutorials we'll be building small little applications.
How long till the end of the day?.
Detect the IP Address of your phone through an external service.
Never lose track of whatever you're counting again.
Test your reaction time, are you a sloth or a cheetah?.
Repeatedly sending the same emails, this app will help.
Display your current position on map.
Try and keep the two circles aligned.