I read this on the Washington Post's Q&A section with Thomas Boswell and thought it was well worth the discussion here.

Washington, D.C.: Should the Natinals trade Nick Johnson well before the trading deadline (as along as he remains off the disabled list)? He's doing great right now, and might fetch some nice prospects.

Tom Boswell: This is the right question. And a tough call. He's 10th in MLB in batting right now (.380) and will seldom be more tradeable. Physically, he looks 100%.

But if you trade him, you only have Dunn and Guzman (switch) as LH hitters. The Nats also want to rebound from their bad start and get their fans interested again. And they still have a chance to do it with the starting pitching now looking much better. Just get the bullpen to be decent.

Still, the long-term move is to trade Johnson when you can get peak value, move Dunn to 1st base and put Willingham in LF. It will be one of Rizzo's biggest calls of the season.

Nick has had a great start to the season, is healthy and doing what we all love (which is hit line drives and have a monster OBP).  But given we probably wont win it all this season (it's hard to accept...even for me in April), do we cash in now with a player in his final contract year (in July)?  Or do we hold on tight and make him a piece of the puzzle in years to come (and hope the injuries are the thing of the past)?

For the record I agree that it's probably one of Rizzo's biggest calls this season...