> I am looking for new job and Once i get offer letter i will
> send it to immigration to change my employer from Old to new.
AFAIK you will need to go to through the same procedure as your
previous work permit. If your first permit require the employer
to have HRSDC confirmation, then most likely the second permit
will require the new employer to have HRSDC confirmation as
well.
> Will I qualify for EI benefits under this Work permit since it
> wont allows me to work for another employer.
AFAIK this is the issue, I heard that you eligible for EI only
if you actually can do another work.
> 3) I got my Record of employment from ex employer and, Once he
> decides to hire me back, can i continue working for him, In
> Case i dont change my work permit to other company and wait
> for him to recall me.
This one I am not sure whether new work permit will invalidate
the old one. Let's wait for other's opinion.
> 4) Does applying for EI effect your Permanent Resident
> application
I don't think so. Being out of work may affect it, though. If
you actually work in Canada, for PR applications in same
category you will get extra score and your application will be
expedited. If you don't work in Canada, you don't have this
advantages.
> or sponser ship application,
As you are not PR yet, you cannot sponsor anybody.
> EI effect my sponsership application In future??
When you have PR in the future and want to sponsor anybody, your
financial / work situation before have no effect. Furthermore,
EI will not make ineligible either.

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(stephan paul) Arif Sahari Wibowo
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Disclaimer: IANAL, IANALP, IANAMD, IANAMP, IANAAP
my statements - if any - should be treated as such.