“So, what is this Digital TV Transition you are talking about?”
You can find out more at:

• http://www.dtv.gov/
• http://www.fcc.gov/dtv/

“What really happened with this transition?”
Some news articles:

• Digital TV launch leaves some stranded (MSNBC)
• Reception problems linger after DTV transition (AP)
• DTV Transition Sparked Calls but No Major Outages, FCC Says (PC World)
• “digital tv transition” trough Google News Search

Most TV’s sold in the past 3 years are equipped with digital signal tuners.