Just to check though, what's your chipset (motherboard) temperature? Altering Case airflow is about the only thing you can do to bring the gfx card's temps down. (well, without voiding the warranty)
If you have an Athlon XP or A64, then a mobo temp of 25-35C is quite normal, depending on Ambient. Up to 40ish is probably just about Acceptable, but probably needs addressing, IMO
if a (newish) P4 system, then 'normal' temp is a bit higher in my experience...
If you could list CPU & mobo temps, as well as system specs, then we'll have a better idea.
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