thought i would add a 2nd review, following Robthebold's.
had received the Commuter Otterbox on the 27th from hard2find Accessories via Amazon.

didn't take me long to clean the screen, put the protective cover on it & add the two other parts...

the goods... wait, i'm sure i felt there was something good about it, just can't seem to put my finger on it, right now

not so good...
- as Rob already mentioned, the two silicon (rubber?) parts which cover the USB respectively the audio connector are a hasle; especially later one is practically impossible to open without some sharp utensil ; the USB one has sort of an edge outside of the casing which makes it a little less tenuous to open...
- keyboard... becomes really difficult to use because the screen casing removes about 2mm of the upper row of keys , typing becomes a hasle. so, if you were thinking about switching over to the N9 'cuz you can live without hw kbd, the Otterbox will push you over the edge
- the rubber (silicon, whatever) topping around the lens / flash assembly is cute, indeed but... why not adding the same around the screen?

and, finally... Friday my N900 had become quite unresponsive & i had to power it down; thankfully, power button was still responding, so i could use that to shut it down but... nope, no @#$%&ßáð way to open quickly the back cover to remove briefly the battery ; by the time i had removed the Otterbox (without breaking it, but without ceremony) i had pushed the power button again and the N900 was happily starting up...

i have had a pouch to carry my NOKIAs at my belt since... pretty much since i had a NOKIA, which is over a dozen years now, thus it is reasonably well protected already.
i'll keep the Otterbox for those rare occasions where i have the N900 in a backpack together with other stuff, but if i had to do it again... i wouldn't