Got hold of a home brew (.xap) file and don’t know how to install it on your Windows Phone? Here is how:
# Go to Start>Programs>Windows Phone Developer Tools> and run Application Deployment
# Ensure the target is “Windows Phone 7 Device”
# Browse to the .XAP that you are loading.
# Connect your phone, wait for Zune sync to finish. Ensure it is not guest.
# Unlock phone and keep it awake. Press “Deploy” and the application should load (not extremely fast, and will appear in your app list without a reboot when done). If it does not work, commit a soft reset and try again.
Note: You must unlock windows phone first