From the following Submissions which gives highest weightage?Which is best method for getting backlinks?
Forum posting / Directory submission / Article submission /Blog Posting.

Just wanted an opinion.

IMO I'd put lbog posting ahead of everything else. Directory and Article submissions are losing their effectiveness and you must be careful about where you submit - it might be a waste of time. I'd rank forum posting 2nd place after blog posting

__________________

Sante J. Achille
Search Engines & Web Marketing Consultant
skype: rifardo

In my view Directory submission and Article submission

__________________
http://www.tradeportindia.com

I think the Directory submission gives more weightage.

__________________
careers new Zealand

Quality content is the right, albeit indirect answer to your question.

In the list above, I would personally rank these as follows, keeping in mind I am assuming quality content is posted:

1. Blog Posting. (Note: This doesn't equal comment-spamming.)
2. Forum Posting. (Note: This doesn't equal reply-spamming.)
3. Article Submission.*
4. Directory Submission.

* If we are talking about the distribution of a quality, optimised non-duplicate press-release then I would actually rate this much higher. Pure traditional article submission, I'd agree with sjachille.