I've updated Yaifo to 4.8 to go with OpenBSD 4.8.
It can be downloaded from Sourceforge.
I've tested macppc, i386, and amd64. I'm having an issue with sparc64 and have not yet tested sgi, alpha, or landisk (which I'm pretty sure doesn't build yet). sparc64 works, it just prints out an error message every few seconds. If someone wants to submit a patch, I can commit it and release a 4.8.1 or something.
Please subscribe to the mailing list and submit any test reports, diffs, suggestions.
Oh, and Yaifo HEAD is now sync'd with OpenBSD -current (as of 2010-11-28).