According to Dave Molinari of the Post-Gazette, the Penguins have not made any trades today. The deadline was at 3 PM Eastern on a day that saw only 11 trades made league-wide. The story of today is more about what did not happen- Columbus reportedly rejected a "mammoth" offer (according to TSN's Darren Dreger) from the New York Rangers for superstar forward Rick Nash.
The Penguins, long-rumored to possibly pickup any of a forward, depth defenseman or a backup goalie, decided to do nothing and stand pat. Pittsburgh's big addition, if it ever comes, will be Sidney Crosby back to the lineup. Crosby's neck/head symptoms continue but he is practicing with the team in non-contact situations and able to exert himself physically to some extent.
Around the league, most the teams are in the playoff hunt, so no one wanted to sell. And even the team's that were out decided to re-sign their key players (like Ales Hemsky in Edmonton or Tuomo Ruutu / Tim Gleason in Carolina) rather than trade them for prospects and draft picks to rebuild.
Finally, it must feel good to be guys Eric Tangradi and Dustin Jeffrey and anyone else who might have thought their number was up this deadline day. They won't have to pack their bags and will (Seemingly) get the chance to stay in PIttsburgh for a playoff run this spring.