On the rapid computation of various polylogarithmic constants (1997) [pdf]

Using this algorithm, I set three records (http://en.wikipedia.org/wiki/PiHex), the last of which stood for 9 years and 10 months until a team at Yahoo surpassed it (http://arxiv.org/abs/1008.3171).

Fabrice Bellard also did some research on pi digits calculations. Because of that, in 2009 he held a record for the longest pi expansion ever calculated.

http://bellard.org/pi/