The "360 view" (like Google's Street View) data for my city (Toronto) is wildly out of date. Across the office where I work there is an entire entertainment center complete with a 50 story condo on top -- which is entirely missing (and still shows a parking lot with cars parked in it) on MapQuest 360.

[edit: from the looks of some movie billboards at this intersection and a few other hints, it looks like the data is from mid-2006].

[edit 2: I just checked my own neighborhood and the building I currently live in, along with the neighboring building are both not yet built. Two condo towers south of my building are still only half-way built. MapQuest Maps == Street View Wayback Machine?]