I agree that guest blog posts are much better option then a blog comments, but it the same time comments can add value if they are natural. In my opinion it more efficient to concentrate on writing blog posts then waste time to find valuable blogs and write comments. I am running sports betting...
Google tries to include buzz and links from SM in rankings algorithm. I think that it is already has huge influence on rankings, but I expect more in the future, especially when we talk about G+.
I think that Panda will have a bad influence on sites with not natural links. Try to diversify your anchors in links to keep it natural. Also I think that it is important to have more inner links to specific pages. Unique content is must if your target is first serp position.
It is really important to have links to inner pages, but in the same time it is difficult to get them. Every page on the site or a blog should be optimized for specific keyword or group of similar long tail keywords. In that manner you should try to build links for different anchor texts for...
I absolutely agree with this. There are many other facts you can check about site except PR. IMO the main thing you can use could be Alexa rank. Anyway, the main thing you should check is quality of content of some website