Image courtesy of zig.

• Torontoist took issue with an ad campaign treating homeless people like billboards, especially after the ad agency's creative director proved he maybe didn't know what "exploitive" means.
• LAist found it to be a sad and grim week with a major train collision leaving over 20 dead (photos), a serial killer on the loose and a deeper look into Skid Row.
• DCist snapped some shots of the Pentagon Memorial opening.
• Phillyist was all about saving cats and dogs this week—especially from assholes who want to do them harm.
• Seattlest wondered if they should be nervous about a new poll that shows McCain gaining on Obama in Washington.
• Shanghaiist covered the latest food scandal in China involving infant milk powder tainted with melamine.
• Gothamist observed the seventh anniversary of the September 11 attacks. Question: Is this NY Post cover too crass?
• Bostonist learned about the unconventional political views of Wikipedia founder Jimmy Wales and comedian Joe Rogan.
• Londonist speculated on what might have happened when 2000 pints of beer were mistakenly delivered to Windsor Castle (the Royal Residence), instead of the nearby pub of the same name.
• SFist wondered where city officials were during a particularly heinous crime wave affecting the city's Mission district.

Compiled by SFist editor Brock Keeling