From what I understand, the mid-2010 MB (MacBook7,1), unlike its predecessors, is able to send audio and video from its Mini-DisplayPort to an HDMI port with a simple Mini-DP-to-HDMI adapter, and does not require extra hardware to convey the audio signal.
Is this in fact true? Are there any other dependencies, such as the make/model of the HDTV? And are there 3rd-party, off-the-shelf adapters (from, say, Staples or Radio Shack) that will fill the bill?
One of our local authorized Apple dealers told us we'd need a separate audio cable!