Brian over at NFA has done a yeoman's job assembling the list of rule-5 eligible Nationals. MLB doesn't make these lists publicly available, so Brian put this list together by looking at the criteria and going through every player in the Nationals entire system to identify who's eligible for the draft and who isn't. Click here to check it out. The guys most likely to draw interest are probably Marvin Lowrance and Ryan Langerhans, but it's possible no one will get taken.
David Pinto has taken his Probablistic Model of Range, one of the better defensive metrics out there, and calculated the cumulative season-long quality of defense behind each starting pitcher in MLB, to see who benefited from good defense and who suffered from bad. You can find the full list here. For the Nationals, you'll see that four of the five the starters Pinto lists--Perez, Redding, and Bergmann--suffered from below par defense, while only Lannan got better than expected defensive support. I think the Nationals' poor defense last year (especially the debacle at first base, but also the poor range of the middle infielders, the carousel of bad fielders not named Willie Harris in left, and the terrible catching defense provided by Lo Duca and Estrada before they were hurt) is a much overlooked aspect of what made us the worst team in baseball. Perez had especially bad support, and if Balester was included I'd bet my bottom dollar that he'd be bringing up the rear in this category also.
Kyle Boddy at Driveline Mechanics has a post analyzing Stephen Strasburg's mechanics and predicting serious arm problems in his future. There's not a lot of good, consistent medical data or analysis on this topic, so take it with a grain of salt. But in short Boddy's worried that Strasburg's overall delivery is too fast, that he brings his elbow too far behind his head, and that his follow-through isn't the smooth, gradual deceleration but an abrupt, jerking motion. Each of these aspects of his delivery could place dangerous stress on his arm, especially his elbow. And as I've said before--pitchers don't get hurt from pitching too much; they get hurt from pitching tired. And if your mechanics cause additional stress, that will cause pitchers to experience greater fatigue and increase that injury risk.