Contributed by jose on from the a.out->ELF dept.
You can copy: ftp://ftp.courtesan.com/pub/millert/OpenBSD/3.4-a.out/bsd.rd to your 3.3 machine's root filesystem and boot off it. It is an a.out 3.4 kernel with the normal 3.4 ELF filesystem embedded in it. This is how I upgraded a machine remotely via serial console...Also remember this earlier piece from OpenBSD Journal on upgrading your a.out i386 system to ELF.
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By Brent Graveland () firstname.lastname@example.org on http://brent.graveland.net/
It will likely have more information in the near future, but for now the doc has been confirmed by a few people to work.
The new doc is at http://graveland.net/openbsd/upgrade-33-34/