Need best wireless projector strategy

I run workshops using my Dell Studio 1558 at a podium and my Casio VGA projector in front of the screen.  Requires me to tether the laptop to the projector with long VGA cable.  Studio has WiFi (b/g/n) and Bluetooth built in.  Casio sells a Bluetooth dongle that supports presentation of jpg-converted PowerPoint slides, but I need to display dynamic links to Web, documents I co-edit with attendees, video/teleconferencing connections, etc.

Is there a good strategy for untethering the Dell from the Casio, but still allow fast interconnection?

Thanks.