I started my career with SEO and I am still doing it. But with the last update, although my sites are still fine but I have started Adcenter / Adwords / Etc PPC advertising. The reason is, G0ogle can screw your business anytime and you would be left with nothing. Start to diversify to Paid advertising - I know many of you will say this is what Google wants but this is what will keep you on the safe side. How many of you have started to diversify more after Penguin Update ?