I have personally tapped the powerboard for power for LED's...
###Note### Significantly dims power led, but works. Per 4DP I would also recommend tapping motherboard power as it is more versitile for later addtions and overall professionalism.
If you (lightly) scratch off the "A" off the power board (below the LED) it will reveal a nice copper point to solder to(DON'T SCRATCH OFF THE COPPER!!!!).
I have 0805 LED's which are not bright even when connected to the 5V point upstream of the resistor like in L0rdnic0's Sound reactive TUT. I have not used any resistors and my LEDS work fine.
I'm guessing 0603's are a little more particular (lower volt or amperage rating requiring the resistor)
###Note### I was not able to get the lights to turn on connected to the negative LED connections per 4DP's pic (which is effing great I might add).
I would suggest using the WLAN switch as your ground point as it is working perfectly for me.....
If you do not your LED's will continuously drain battery power and be on (but very dim) when the PSP is off as it is constantly shorting power to ground.
SSSSSTTTEEEAADDDY HaNdddsS required
As well as Hot Glue Gun, Exacto Knife 15Watt Soldering Iron, Flux, Paintbrush(for flux) 00 Screwdriver and small dykes.