Hi there, the WiFi shields are good only if you simply want to connect your electronics to the Lan. I'm using Flyport module (openPicus open source project, also italian) that provides a real embedded Webserver with WiFi. Jquery is also supported and I've to say the performance is very good.
I just say these days they made also an Arduino like socket to connect the Flyport module to the Arduino shields.
The only minus is the IDE only for Windows....but I can survive