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I don't know if anyone besides Aaron and I are fountain pen enthusiasts, but I thought we might need a thread for those of us who are.
Brad Perri recently turned us on to Noodler's Ink (http://www.noodlersink.com/), which is awesome ink you can use in refillable fountain pens, roller balls, and highlighters. Brad bought me a bottle of "Legal Lapis," an interesting blue that looks much better than regular blue ink, but still makes it easy to tell apart from copies.
Definitely worth checking out, especially because you get a free fountain pen with each bottle of ink!