Knockout ref without getting dq.
This only works if you have the powerhouse selected as your main fighting style.
Now we all know that there are cheaters out there(me) so this could be useful to them. Instead of hitting the ref, and getting disqualified, just go up to him and hold O to do a strong Irish whip. Now, aim for the ropes, and let him go, and he should run towards the ropes, and fall through them, and land outside. That's the way to do it. It also gives you alot more time to whack someone with a chair or hammer,etc.
Hope this helps.
We have more cheats and tips for this game here, WWE SmackDown! vs. RAW 2008 cheats