This is cool to see. I'm a bit sad that the ARM port hasn't made any visible progress - I remember back when the Raspberry Pi came out that there were a few discussions about other hardware being more adequate/future proof, and now that there's a quad core model it would be a great OS to run...
The ARM port presently boots all the way to the startup screen, but then it halts because it has no way of reading the boot medium, because the USB stack hasn't been ported to ARM. Patches accepted! :)
What didn't the README and README.Compiling explain adequately enough for you? (And of course, feel free to pop into Freenode#haiku and ask us questions...)