Storefronts Revamped - Jeremy Novy is an artist which paints over boarded up buildings and houses to improve aesthetics in neighborhoods, including the State Street Theater in Milwaukee (pictured).
A couple creative uses of the pedestrian crossing sign in Madison, WI:

Red bull gives you wiiiiiiings!

'Drunk Student Crossing' at Ian's Pizza (arguably the best pizza place... ever)
listed in: art, ian's pizza, madison, red bull | Comments (1)
The Shadow Project - About a girl who put up black shadows around Brooklyn, and then took well-timed photographs of the results.
listed in: art, photography | ∞
Urban Prankster - The latest addition to my RSS reader. As described on their website: "Urban Prankster covers pranks, hacks, participatory art, flash mobs, and other creative endeavors that take place in public places in cities across the world." And not that super-lame stuff people pull on hidden-camera shows either.
Evan Roth: Available Online for Free - Evan Roth, the guy that brought you lazer-graffiti machine, the Jay-Z video made out of letters, and the TSA Communication Devices (pictured), released a cool compilation book of his work titled "Available Online for Free". Which, is appropriately viewable online for free.
Pedestrian Street Art by Peter Gibson - Art created by adding onto existing street paint.
The animation is really fun."In 1969, a 14-year-old Beatle fanatic named Jerry Levitan, armed with a reel-to-reel tape deck, snuck into John Lennon's hotel room in Toronto and convinced John to do an interview about peace."
Found on the 4th floor of the humanities building at UW-Madison. Comment with your interpretations.
[More]listed in: art, uw-madison | Comments (1)
iPhone Pixelizer - Turn your iPhone into a piece of abstract art!
listed in: art, do-it-yourself, iphone, youtube | ∞
Flight Patterns - Amazing video created using data from US flight patterns.
listed in: art, data, video, visualization | ∞
I noticed these at the Kohl Center today. When did this happen? I'm fairly certain they were not here yesterday. They are pink and gold. When finished, they look like they will be lit from both the inside and outside.
Um, why? They're just as ugly as that giant phallus outside Camp Randall. Please take them down, unless they do something cool like project a giant "W" against the night sky. At least paint them RED and WHITE.
Edit: Ohhhh... they change colors at night. Well, they still look out of place.
Vicissitudes - A set of photos from a somewhat... creepy underwater sculpture.
Mark Jenkins - Portfolio of clever Street Installations.