First up, if you have a condition where stress can seriously affect your health, maybe just leave it displaying that clock/cpu/matrix orbital cycle for a bit; seriously we don't want the GX killing anyone. However, with a little work and a bit of direction, it will be easy create some pretty wicked screens.
Running Plugins: the program must be running for LCDStudio to pick out the info. ie. iTunes info will not show until iTunes is running, the same for monitoring plugins like SpeedFan.
Spectrum Analyzer Effects: are done from the widget window, and as listed are only available for Winamp.
Temp Sensors: are not required for the GX, it will draw system information from monitoring programs such as SpeedFan or MBM.
External USB Cable: chosen as the easiest way to interface to the GX, and internal option is available for more advanced applications. This was seen as the least of all evils; pick the internal only and difficulty increases, pick both and the price goes up.
Below I've taken a screen shot of a pretty simple screen in LCDStudio, I'll go over it quickly here.
First: open iTunes, open SpeedFan
CPU Gauge (Top Left): drag in a gauge widget, re-size and set max to 100 in properties, drag in the CPU load
Temp Bar (Second from Top Left): drag in a bar widget, re-size and set max to 50 in properties, drag in the HD temp from SpeedFan
Mem Usage Chart (Third from Top Left): drag in a pie chart widget, re-size and set max to 100, drag in the mem usage %
Network Info (Fourth from Top Left): drag in bps in and bps out from network data, drag in TTF widgets and change text in properties
Clock (Top Right): drag in clock widget, re-size
iTunes Info (Bottom): drag in artist and name from iTunes current track data, drag the length in to the far right, drag in a bar widget, set properties left to right and re-size, drag position % from data onto bar
More info on LCDStudio: Check out LCDStudio
and LCDStudio Forums
for more info.