iPhone: Popular email client Sparrow has added support for POP email clients. This means that if you're a Hotmail or Yahoo user, you can now use Sparrow just as you would with Gmail.
The desktop version got POP support last month, and this update to the iPhone app is the same. The update doesn't add much else except for a fix to a folder-mapping issue, but if your primary email client is POP, then it's a welcome addition.
Sparrow [iTunes App Store]