As mentioned on Mendel's blog: http://mendel129.wordpress.com/projects/wol/
A project of mine, a wake-on-lan client for WP7
It was the first real wake-on-lan application made for wp7. Real, meaning it doesn’t use any intermediate proxy server or whatever. This app operates directly from your device, using the sockets in WP7.1 .
V1.1:
updated with live tiles Using them you can wake your computer with one click of a button 8-)
V1.2
per-device different icons :-)
v1.3
page animations, own device icons, some other visual improvements :)