Thank you for using justanswer. Yes, you may still file Form 8843 for tax year 2009. In fact, you absolutely should file it. Filing this form lets the IRS know when you have fulfilled your 5 year time span and is your proof that you are now eligible to file as a Resident Alien in 2010. Here is the link to the 2009 Form 8843:Form 8843
Form 8843 is only required while you are considered a Non Resident Alien, so you should not file that form once you have reached Resident Alien status.
You stated that you did not have any earnings in 2010. I just want to be clear that once you become a Resident Alien for tax purposes, you must now report world wide income on your tax return, so even if you had no earnings from the US, if you have income from your home country, such as rental income, income from a business held in another country, etc you would now need to report that income.
If you don't have any income from overseas, and you had no US sourced income (W2, self employment, etc) then you would not be required to file a 2010 tax return.
I hope this helps.