Hello everyone, I had 2 jobs during year 2009. One from may-2009 to june-2009 and second from june-2009 to till date. And for both jobs I didn't get exempt from FICA and it has been taken from my salary. My question is that do I need to file two separate form-843 for both employers?

Yes, a separate Form 843 with its own set of support forms needs to be submited for each employer.

Further, for the second employer, TWO separate Form 843 packets are required, one for 2009 and the other for 2010, though you SHOULD go to the employer with pages 50-51 of IRS Pub 519 to show them that you are EXEMPT from FICA taxes to get the 2010 withholdings BACK from the employer.