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Adam Jundt at SDSC just let me know that there's now a yt module on Trestles. If you're running there you should be able to load yt with "module load yt".
We now have modules at Trestles, Nautilus, Kraken and I'm also told on Odyssey and SciNet. Having modules created for community usage is a strategy we're going to try to keep pursuing, so let me know if there are modules elsewhere; this will soon be on a central wiki or document of "maintained installations."