if I have a blog as mydomain/blog with excellent pagerank, thousands of incoming links, SEO-goodness etc; will that blog help me rank for keywords on my main site's pages even though the keywords on that main site are not mentioned on the blog? but they (blog, pages on main site, keywords) would be same theme of home decor category. I am thinking of buying an existing popular blog and moving it to mydomain/blog. this is essentially an alternate method of buying incoming links to my main site as i will add the redirect from the old blogs domain to mine once i own it. but curious if SEO for the blog improves SEO for the main site.wouldnt all inbound links to the blog now be inbound links to the site if the blog sat at site/blog? and if so , wouldnt that help each and every page of the site rank for its keywords? or would it only help site/blog/pageX rank for its words?
If the domain ownership changes hands, Google resets the links pointing to the blog to zero - so keep that in mind.
As stated by meethere, the keywords will help only the blog not the whole site. As far as what you are talking about, you would be better off buying the blog and placing links to your site on it. If you add it as /blog, the PR juice will not pass because it will be considered part of the main site. You would be much better off maintaining it as a separate domain. If you are planning to buy a blog for building links to your site, you would be better off finding quality links from several sites for what you would pay for a good popular blog. This is crap! I have sold a few sites and they maintained all links and PR through several updates without any further work from the new owner.
@allout - I should have been more specific. If the WHOIS information of the domain name itself changes, Google applies this element.
If you add it as /blog, the PR juice will not pass because it will be considered part of the main site. You would be much better off maintaining it as a separate domain. but what if i redirect the blog.com to mydomain/blog, then doesnt pr juice belong to mydomain???
There is no such thing. If that was true there would be no one that buys sites with high PR. I have a domain that I have had for three years. I found out later that it was a dropped domain and it still shows a back link from 8 years ago when it was a totally different site with a totally different owner. Redirects do not work well for passing PR. The redirect would point to your blog which is the page that would receive any juice from the PR. The main thing that PR is good for is selling links, if that is your intension, buyers will very easily see it is a redirect. I do not see it as a smart strategy but you may find someone who disagrees with me.
hmmm i have read and article before that when you redesign your domain or you have done changes there will be changes on the your rankings is that true?
I think unless you keep it on the same server as it was and not change to much, they would not catch it, but I am not too sure myself.
Not really, unless you change your page names, and some links are lost because they target pages that don't exist anymore. Ranking represents more or less the number of backlinks you get. It is not directly linked to positionning. Redesigning the website can improve (or not) your positionning. The only case where you ranking can be affected by a redesign or "changes" is in case of a penalty for "bad practices". But that's seldom.