The most recent OpenBSD release is 2.0. You can find these files in OpenBSD/2.0 on each listed FTP server.
As well, snapshots will be made available from time to time on the ftp mirrors. The snapshots are available on each of the FTP servers listed below, typically in the directory OpenBSD/snapshots. If you plan to use a snapshot, you should also read the general description about OpenBSD snapshots.
NOTE: please do not fetch binaries directly from cvs.openbsd.org but instead use one of the mirror sites.
The file structure of each FTP server is roughly:
.../OpenBSD/2.0/
.../OpenBSD/snapshots/
.../OpenBSD/X11/
.../OpenBSD/src/
.../OpenBSD/tools/
If you add a new FTP mirror site, please contact the FTP maintainer.