I did not file for 2005 or 2006. I had little or no income and can't even remember where I worked if I did. Where can I obtain this information and can I still file for 2007 this year?

First, regarding filing for 2007 - the answer is yes. Don't let the fact that you didn't file in 2005 or 2006 stop you from doing what you need to do for 2007. If you had little or no income in those previous years you may not have been required to file anyway - for example if your earned income was under $7500 (I don't recall the exact numbers for 2005 or 2006, but you get the idea), you had little or no unearned income, and you weren't claimed as a dependent by someone else.