I have completely overhauled the Power Girl Comics page. (For comparison, here is the old version.) The new page foregoes listing Power Girl’s current and upcoming appearances – Grand Comicbook Database and Comic Book DB do a far better job than I could – in favour of listing the major eras in Power Girl’s history and highlighting the trade paperbacks that are available. The end result is far more informative, I think.
I’d previously thought there were more issues of the 1970s’ JSA run in All-Stars Comics to be collected in TPB, but actually the two volumes that are out are it. Power Girl’s next major run was in Infinity, Inc. That series is currently unavailable in TPB, so I have provided…alternative means of revisiting those stories :)