Well, it is possible. Almost a fully functioning little machine running OSX.
...and since I have a family license (5 pcs) for Leopard I decided to try. In my opinion the so called retail install is a much more elegant way of installing OSX on not Apple computer (still the legality is questionable), but the EeePC 900 has a Celeron processor and retail install disk just simple does not work.
The most important thing to note is that the wifi card in the 900 is less then supported, so it is a good idea to swap it for a real Apple Airport wifi card.
Other than that the machine works fine (also the os needs to be installed onto the secondary 16 GB SSD, because the primary is only 4 GB), unfortunately the 16 GB SSD is way slower that the 4 GB. It is really a good idea to upgrade it to a bigger and foremost faster SSD (RunCore seems to be a good choice).
The installation:
1. Grab the iDeneb installation disk (it is available thorough the net, but if you decide to keep the installation, please go to Apple and buy a Leopard install disk), I tried the iDeneb v1.4, 10.5.6
2. Install ...