Fabrice Bellard has managed to calculate pi to 2.7 trillion decimal places using his Core i7 desktop PC, Fedora 10, 7.5 TB of disk space in a RAID-0 configuration with an ext4 filesystem and 131 days of compute time at a cost of "less than 2000 euros". He beat out the previous record of 2.6 trillion digits calculated on a Japanese supercomputer in 26 hours. He plans to release his code in the near future, for 64-bit architectures only.
Pic from DownloadSquadEhtyar.