I just got in my LEDs today (one blue, one red) from
case-mod.com. I'm pretty happy with the brightness of both. The red one is brighter though... 3500MCD (MCD = millicandela = 1/1000th of a candela = supposed brightness of a single candle) compared to 1500MCD for the blue one. If I have the lights off, either one will illuminate a fair-sized area on the opposite wall of my room. They're plenty bright for me, esp. at 60 cents for the red one (sale might not still be going on).
edit: the 10000MCD ones listed above appear to be 5.9mm in diameter. The ones I talked about are 3mm in diameter and this appears to be the size for most computer-related LEDs.