Basic idea and alot of people have done it.
Should tell you something...
I was wondering about the responsiveness and speed of a wifi shield with an arduino, when i send data using a program written on my android or pc, will the data be received virtually instantly, like i can accomplish between pc and pc or pc and android.
Received by the WiFi shield, yes. Transferred to the Arduino? Not quite so fast, but fast enough, if you are not sending novels.