If you shoot Canon, keep reading.
I decided to part with my Tamron lens. I'll be upgrading. There's nothing wrong with the lens, it's one of those "it's not you, it's me" situations.
Tamron 28-75mm f/2.8 XR Di aspherical macro lens (this is one that Karen Russell recommends if you can't get the Canon version, it's got great reviews)
Purchased new in June 2010 for $522.
Comes with both caps, hood, box, receipt.
Great all around lens. Perfect for Christmas family shots, indoor shots, etc.
Asking $425 but I will entertain all reasonable offers.