It's in sRBG. The issue is IE (8 here) dosn't apply the monitors ICC profile. If you save it to your desktop and open (even with the windows image viewer) it, then it looks correct (Windows Vista/7 are color-managed operating systems).
The reason the image looks dark is because of two things. 1. I didn't brighten it nearly as much as the two of you did -- I wanted to preserve the shadow on the right side of the face and not blow the left side. 2. My monitor is a "Super-bright" LCD, not ideal for photo editing because things appear brighter than they are.
As far as calibration - my monitor is as close as it can get - I'm pretty particular about it. I don't have custom ICC profiles for it though ;(
Thanks for the compliments!