I just hate when I get a coffee stain on my clothing. This just happened to me in the car the other day...driving...drinking coffee...talking on my cell phone (I know, multi-tasking isn't a good idea, especially when you're in control of thousands of pounds of fast-moving metal...aka: Honda Accord).
Anyways, I got the coffee stain out of my favorite Gap khakis because I treated it quickly by soaking it in laundry soap and some bleach. But, sometimes stains set and just won't come out.
I've had success from soaking the entire piece of clothing in strong coffee...no, it's not a white shirt anymore, but at least it can still be used and the coffee makes for a nice color.