Hi purpleonyx,
I ordered the same holder and received it today (less then 2 weeks, too). There's indeed no hole for the camera. But my problem is, that the mount is not symetric and so the N900 does not really fit into it:

Does your mount look the same on the right side? The left side would fit for the "lower" part of the N900 so that I could even open the keyboard while in there, but the right side ... OK, another picture with the N900