If you know what a box is and you know what the internet is, then you should have a pretty decent mental picture for what Box.net does. Basically they offer online storage that you can access from anywhere, share with anyone, backup any documents to, while washing/waxing your car (your account may not have the car-washing feature).
Box.net is newly located in Palo Alto, CA (home of yummy frozen yogurt place Fraiche), and is definitely in the running for best looking building on Office Snapshots. The box logo looks great above the arches and on the white background. The interior of the office has a lot of empty space to grow into (Go here for Box.net openings). The move looks like it has given the company a new and refreshing place to call home that the employees are visibly happy about. That and the fact that they are drinking beer.