Looks like someone was able to install OS-X on a Dell Mini, nice…
The steps to Leopard-ize the mini are actually quite simple and easy to follow. After you download the slipstreamed ISO and burn the 3.2GB ISO to a DVD you boot up the Dell mini off a external DVD drive (Press 0 (Zero) at the BIOS screen) and installed Leopard as usual.
via laptoppimp,

