Fedora (and probably Red Hat) really really appreciate the contribution community developers bring to the popular Linux distribution. So much so, they want to give out some presents - 220 presents to be exact. Since that isn't enough to go around, contributors will be randomly chosen from a sweepstakes pool.
Fedora is giving away 50 OLPC XO 1.75 machines, 150 Raspberry Pis, and 20 Arduino Uno R3s with one shield. Officially recognized contributors who have a Fedora account, signed contributor agreement, and is "a member of at least one non-CLA / FPCA Fedora Group" are eligible. Oh yeah, contributors get brownie points for sharing their intentions towards mankind for the hardware in 500 characters or less. Entries must be received by August 15, 2012 and drawings should begin around August 16.
Winners will be chosen in three rounds of random drawings of entries. The first to choose 50 from those who requested the OLPC XO. Then a second round will select the 150 Raspberry Pi winners, and then a third for the 20 Arduinos.