Though I'm sure there are some LightRoom users here, you might want to ask your question in the Lightroom-specific forum: http://forums.adobe.com/community/lightroom
That does look kind of bizarre when magnified, doesn't it? Some kind of edge ringing... Can't say I ever see anything like that in the 2010 process output from Camera Raw in Photoshop CS5.
Process 2010 has less noise reduction than process 2003 (because it uses more refined NR controls), and will seem sharper at default settings. However, it's difficult to say what your problem is without knowing what Details (sharpening and NR) settings you are using in your examples.
You probably need to adjust/tune your sharpening & NR settings. Sharpening and NR changed between the 2003 and 2010 process versions. What worked optimally in 2003 will usually not work optimally in 2010.