If you have a notebook or pc with HDMI output and a big LCD TV with HDMI input, you might want to connect those. Unfortunately, this doesn't work out-of-the-box with the Dell Studio 15 notebook, neither with Vista nor with Ubuntu.
Now I got it working both in Vista and Ubuntu (8.10 - Intrepid Ibex).
In Vista I needed to update the AMD ATI Mobility Radeon™ HD 3450 driver
download Vista driver from Dell.
Then you need to configure windows to use the HDMI audio output.