I think most new Macs come with a Apple licensed version, mine came with version 3, never really noticed it until a few months from purchase. There might be one preinstalled on your mac.
I have v 2.2 (34.15) when i launched it, there was an update notice, and after i downloaded the update, it was v 2.2 (34.24). it doesn't look like an update (such as the itunes updates, etc). uncanny.
Can anyone suggest a Flowcharting software/feature for Mac? It would be more OK if it's from an iWork or Office for Mac applications