Batgirl swooped back into the cosmic comic consciousness bigtime this year. The entire supporting cast of the various Batman series got a fresh shot at center stage with Bruce Wayne dead for most of 2010. Now the dust has settled, I’d say that Batwoman (who is unrelated to Batgirl—think Wonder Woman and Wonder Girl, not Superman and Superboy; that really should be the basis of an SAT question sometime) is the breakout “new” character while Batgirl is the one who’s truly reaffirmed her place in the Bat universe.
[Will add to this post later. Same bat channel.]