OK, installed my new switch..... Nothing, nada, no change in speed. I was still connecting at 30m. I thought, "What the heck!!!" I ultimately found that the ethernet port on my PC wasn't working. I had given the enthernet port priority over wireless in my network settings, but since it was not working it had defaulted to wireless. So I had been running wireless from the PC to the router, and wired from the router to the PS3. I now have a new NIC coming in the mail.
Come hell or high water, I will get this thing sorted out.