The OpenBSD project has released OpenBSD 4.2 adding new and improved platform support (hppa, sparc64, alpha), performance enhancements and new security features and is available for download on the FTP mirrors. A detailed log of changes is available here.
The OpenBSD 4.2 release song, entitled "100001 1010101" has also been available for some time now.
As of OpenBSD 4.2 you can now download a ISO image containing the install sets. The install42.iso image (md5 03dc43a1d18d3003843a1f13b3861917) can now be downloaded and simply burned to a CD. You can get the image here:
ftp://ftp.su.se/pub/OpenBSD/4.2/i386/install42.iso or on any other FTP mirror.