> Fail to use the new iMac as a TV

In case you heard about the fact that Apple's new 27" iMac can also double as an external monitor, and you were getting excited about all the different kinds of devices you can attach to this thing — don't. The iMac will only accept DisplayPort input. This 'feature' is designed not for your convenience, but to promote an Apple-favoured standard with little prior presence in the marketplace. DisplayPort might eventually achieve wide adoption, but by the time this feature becomes generally useful, your iMac will almost certainly be obsolete.