Go is just a pleasure to work with on so many levels! This long weekend I participated in a small hacking challenge @ http://h11e.com
: find the smallest SHA512 hash from any string shorter than 64 characters (they didn't specify whether unicode, so I assumed ascii printable).
I wrote a small go program, parallelized it and set it going on a few of my computers: http://play.golang.org/p/LVvPBdf-Wc
I came close to getting on the board early on, when 4 starting bytes of zeroes would've gotten you the top, but 1 trillion hashes later, I have still not found a sha512 with 5 leading zero bytes. That's not what's interesting though: up until this morning one of my dual-core machines was churning 1.4 million hashes/second. When I updated the (month-old) Go distribution to tip the count jumped to 1.7 million hashes/second.
I delight in realizing efficiencies :)