The ebay link works for me. There are lots of similar keyboards out there btw. My father has this one [1] to control his android-driven HTPC. It works quite fine if you compare it to the N900's HW keyboard but it doesn't replace a true PC keyboard. My father also has this one [2] which he uses more often because it's simply more convenient.

[1] http://www.pearl.de/a-PX2567-1002.shtml
[2] http://www.pearl.de/a-PX3362-1002.shtml