If this result is reproducible -- and I suspect it will be -- the consequences for physics are extraordinary. (Among other things, it will explain why electric charge is quantized)
No time to write a lengthy explanation right now, so this one is mostly for the technically minded of you in the audience. The experiment article was published in Nature, and those bastards appear not to have even posted it on the arXiv, so only people willing to deal with Nature (which I'm basically not) can see it at the moment. The theory article, on the other hand, is here: http://arxiv.org/pdf/0903.4732.pdf
. The theorists basically wrote a paper giving fairly detailed experimental instructions for how to build a Dirac monopole in the spin field of a spinor Bose-Einstein condensate, and the experimentalists did it and it worked. I'd call this a very clear sign that no, nature doesn't have some kind of trick up its sleeve preventing the existence of monopoles.
Hey, maybe Blas Cabrera's famous monopole was the real thing after all...
(Bonus points in the theory article for studying how this synthetic monopole would decay when you turned the power off. It flies off the edge and transforms into a boojum. I can't think of a more appropriate thing for a magnetic monopole to decay into.)