Usability 
In LA for the Oscars? Don't miss visiting the Hollywood Walk of Fame, 2500 pink and bronze stars set in three and a half miles of sidewalk beginning at the corner of Hollywood and La Brea. Each star is dedicated to a great performer or fictional character from motion pictures, live theater, radio, television or recording.
You can buy overpriced maps of the Walk of Fame at tourist traps all over the LA area but there's a better way to navigate the walk and it's free. dotMobi's James Pierce has created an interactive mobile guide to the Walk of Fame.
It's at hwof.mobi and is a map based turn by turn guide to the entire route. As you travel along the route you can read biographic information about the recipient of each star at your feet.
You can also search for a star by name or browse through listing of recipients in each of the five categories (motion pictures, live theater, radio, television or recording). Each star has it's own page with a photo of the sidewalk star, biography of its recipient and a map of the star's location. There is also a history of the walk and directions to the starting point. If you are lost, the site's "Where am I" feature lets you type in a street name to pull up a map to get your bearings. Hwof.mobi is a great example of using mobile context to deliver information relevant to the user's location and activity.