I work on Ethereum projects full-time. I'm most interested in the Ethereum Name Service, currently. My most recent project is a Python client for ENS
Fuller list of projects I have contributed to:
- https://github.com/ethereum/go-ethereum (minimal)
I first got excited about how contracts in Ethereum deliver on the promise of Open Execution. The Dapps that play to those strengths will be first to take off, imho.