Hey, clutterydrawer's got a really good idea. I hadn't even thought about it, although once mentioned, it sounds like common sense.
Take it out, boil it more, and keep it in a bucket of water (replace the water as it gets darker) until the water you're taking out of the bucket becomes as clear as you want it. Or, you know, you could just live with it.
I got some mopani driftwood for my tank, too, and it did the colouring thing. Not too bad, though, and now (after 6 weeks or so) it's starting to get almost as clear, kind of, as it was before the wood was put in.
Oh, and I have activated carbon in my filter, and it hasn't seemed to help an incredible amount. Or maybe it has, I'm not sure, I haven't tried it without carbon.