I am running one project now and I would like to find good and highly visited blogs on the above topics - could you advise me which blogs you read/are subscribed for which are really worthy ones for webmasters, SEO and internet-marketing specialists?
Thank you all in advance!

Here are my favorite SEO and internet marketing blogs:

http://www.seomoz.org/blog
http://www.searchengineland.com
http://www.searchenginejournal.com
http://blog.hubspot.com/
http://www.seomistry.com
http://www.seobook.com
http://www.searchenginewatch.com
http://www.searchengineroundtable.com

There are so much more but these ones are great

Thanks a lot! Yes, you are right, these resources are really great!

YEh there are a lot more awesome blogs and resources out there.

What one have you found especially useful with your research?

You can also check for some of the famous bloggers like amitbhawani.com
blogsolute.com
labnol.org

Alaister,
Well, I am still looking for them. Have contacted quite a few already. My aim at the moment to find those blogs who can publish a review or an article about our AdNetwork - http://fidelity-media.com as we are trying to attract new publishers to it. So, I will keep on researching.
I will appreciate if you could advise me your favourite ones.