This is a trojan used in cyber espionage, originally targeting Iran. It appears to have been around since 2010 (and maybe as early as 2008) and is touted as one of the most complex trojans and C&C infrastructures created to date.
I will update this article as more information becomes available. Keep in mind that although this started as a targeted attack limited to Iran, current stats reveal that many more hosts in other countries have been compromised. Statistics based on Kaspersky's KSN notes at least 11 compromised in the United States. Remember that Kaspersky is just 1 of many antivirus vendors, and isn't one of the top vendors in the US - which means there are far more than 11.
Flame received a suicide command from its command and control servers at the end of May, deleting all of its files and overwriting with random garbage.