I and the Bird #79: The Third Anniversary Edition is up on 10000 Birds and the celebratory topic is "Why are you still bird blogging?"
Change Of Shift - the Second Anniversary Edition is up on Emergiblog and the celebratory topic is explained by Kim: "In celebration, I asked nurse bloggers to send in their first posts and tell us a bit about why they started blogging."
Both are really worth checking out. Congratulations to both long-living carnivals!