谢谢了!
-Just wait until Jan. or Feb. 2010 to see whether you receive the Form 1099. If you receive this form, that means they have reported your income to IRS, and USCIS may find it in the future. So, you just need to go out of U.S. (e.g. China) to get an H1 visa to come back to clear the record and thus, you will never have a problem anymore (no more affect your future GC application).
If you do not receive the form 1099, you do not need to worry about it because that means they did not report it to IRS (不用缴税).