Let's say I wanted to pitch up entire audio tracks that were recorded somewhat flat (like maybe 15 cents or so) without affecting the timing.  What method would you recommend that caused the least damage to the audio?

External digital audio editor. The iZotope Mix algorithm in Sonar has no option to change pitch in less than semitone increments.
 
However, if you could cope with more of the effect imparted by tape varispeed, which changes pitch and duration somewhat, using the Loop Construction window to do pitch fine-tuning (not loop construction) works really well.

I'm thinking probably more of a high fidelity resampling approach.  Timing must remain invariant while increasing pitch.

I'd use melodyne. 
When in melodyne, just select everything and click on one note and drag up,
while holding down the alt-key.
 

Loptec
I'd use melodyne. 
When in melodyne, just select everything and click on one note and drag up,
while holding down the alt-key.
 

Didn't think about Melodyne for the entire track, but that is exactly what Melodyne is doing, resampling.  I'll check it out.  Thanks.

bitSync

Loptec
I'd use melodyne. 
When in melodyne, just select everything and click on one note and drag up,
while holding down the alt-key.
 

Didn't think about Melodyne for the entire track, but that is exactly what Melodyne is doing, resampling.  I'll check it out.  Thanks.

Try percussive mode. It puts all the blobs in a linear fashion.
 
Note that Melodyne does affect timing somewhat with transposition. Whether this is significant or not depends a lot on how much you transpose and the material itself.

I usually export audio from Sonar and use Best Practice, a free program that lets you change time and pitch, works good for me.  You can get it at:  http://download.cnet.com/BestPractice/3000-2133_4-10794555.html

Couldn't you use resampling by calculation and then CTRL+drag the clip edge back to fit (time stretching)? I have never tried but it seems pretty straightforward.

IDK the best way, I am pretty lazy so I would dial it up using zplane Elastique Pitch. Should do a pretty good job with 15 cent change.

scook
IDK the best way, I am pretty lazy so I would dial it up using zplane Elastique Pitch. Should do a pretty good job with 15 cent change.

FYI that's the algorithm included in recent versions of Sound Forge.