BtcBalance is a service wich you can use to store your Bitcoin addresses to view their current balance and total received balance. You can add up to 50 addresses to your account and make as many accounts as you want. So if you're at school or work for instance and don't have access to your Bitcoin wallet, then you can add your addresses to your BtcBalance account and view their status.
bit.ink is an invite-only online community focused on the discussion of digital currencies, such as Bitcoin and the wide array of similar projects it has inspired. Think of it as Hacker News for digital currency, without the naive shilling culture of /r/Bitcoin.