This issue is a variant of Superman (DC, 2006 series) #675.
Two covers were done for this issue; one featuring Superman by Alex Ross, and an alternate one featuring Superman, the Galactic Golem, and Paragon by Guedes/Magalhaés (10 issues for 1 issue mixture).
For every 10 copies of the standard edition, retailers were allowed to order one copy of the variant edition.
Story continued from previous issue. "Special thanks to Alex Ross for the Paragon redesign and to Fabian Nicieza, Daxamite Monkey Cleric". Kurt later explained this credit (at the Comic Bloc website) this way: he rattled off a story to Fabian using him as a sounding board and editor-at-large. From this verbal plot, he typed up a "beat sheet" -- a page-by-page outline -- and that allowed Kurt to type up the actual plot faster.
Mike talks about what's coming up in Batman Confidential. Ads for Superman #676, Countdown #2, Gotham Underground #7, and Robin #173. Appears on page 50 in this issue. Note: The ad for Superman #676 (next issue) shows a cover and a description that was not used for that issue; a substitution for the contents was made.
House ads for: Justice Society of America (Insurrection), Batman: Death Mask, Final Crisis (The Day Evil Won), Starman Omnibus #1 hardcover, New Gods action figures, Batman R.I.P., Titans (Together), DC vs WS: Dreamwar, and Justice Society of America: Thy Kingdom Come Part 1 hardcover. Appear in various places in this issue.
Total of 3 one-page ads for: Professor Layton and the Curious Village (video game, Level-5), Top 10 Ways to Tell if your Home has an Energy Hog (advice, Ad Council/7-Eleven), and abovetheinfluence (Partnership for a Drug-Free America). Appear in various places in this issue.