Coinbase - Bitcoin, safe and easy.
Ethereum Name Service - Like DNS, but for Ethereum wallet addresses
CoinSparrow - A marketplace for buying services with crypto
How DNS Works - Super cute web comics about 'How DNS Works' for beginners!
CryptoMarket - Price tracking app for bitcoin and altcoins
SolveDNS - SolveDNS works to check your name servers, a records, and mail servers, SOA records for errors, consistency, efficiency and speed using several DNS tests.