Last year i had worked in 3 companies and was able to file for only 2 of them coz 1 of them arrived late after the deadline. I still have that W2. i am wondering if i could file that W2 taxes this year online.

You have 3 years to file your tax, and if you do not owe tax, it does not matter when you file. You should ask last year and we would have advised  you to await for the W-2 or if you had your pay check's last stuff, you would have put that information. You did not do either of them, just did it..
 Now you have to AMEND your 2008 tax, Federal as well State. Federal is pretty easy but do not know about State. But we can run on tax software and find out how it works?
How you do manually:
You have to put all w-2 and find out federal and state tax you have to pay or get refund, now you have the difference, that is what goes on 1040 amend, but you have to explain each line for the difference.

seems like lots of work. it was just about $150 federal refund so i guess i would better not worry about it.

Hey syal.

Why not? If you are student then you'll get minimum 1700 in refund, also, you'll get supplemental refund from state. I received 3000 in refund even though I paid only ~100 in tax last year.

hey 1, 

Hey #1, u received the good tax returned. Just share the ideas how we'll get good tax refund.

no prob, yea got it. I did not read your first posting.
@ gorkhe- find your school employers ID and then use that to get refund for education benefit. If you worked on campus then you can find your schools id in the pay check.