It is not so easy to find niche specific high PR blogs. You need to collect the sites and have to analyse those sites like their internal, external, domain authority and page authority. Also check backlinks from where those sites are getting backlinks from relevant and quality sites which helps your site to be safe.
Try going to drop my link and search for your niche specific blog. You will got the list of the bogs now you can look at them one by one and can use that blog to upstream your website.
what I do is to use "screpebox". Enter list of keywords, get list of urls and sort them by PR. Than post.
I think no any way to find this because its possible by blogger.com.I mean to say you These categories represent two conscious decisions that bloggers can make: I’m going to write about everything, or I’m going to write about one thing. Niche blogs are when you write about one thing, and one thing only. They are a blog with a one-track mind, having one purpose, one goal.
And through this we can save our time to visit a blog by user and gets a lot of traffic.
niche blog are not a blog list its a technic to improve our blog traffic and visit.
Apart from Google, other place where ton of content /blogs available is on twitter. Create the Niche word as hash-tag and add the word blog to it and you will find tons of entries there. Outsource there is limited life of the tweet, so will have to search more often or create a feed in Hootsuite on that Niche word and you will continue getting the Blogs on that keyword subject.
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What are you trying to do and accomplish? The prime directive online is to add value, real value not try to beat the system. If adding value is the goal then great. If trying to get backlinks by posting and adding links then that is easily seen as trying to game the system. Google is the house and always wins. They reward adding value so keep that in mind..
Go to http://moreofit.com and type in the niche plus the word "blog" you are seeking then take those sites with that information and run them through http://seo-now.page.tl/free-seo-tools.htm http://siteexplorer.info or seomastering.com or several other analytical services to find their PR status.
Go to sites you know of in your niche to see if they have blog rolls with their favorite blogs listed. That's an excellent way to mine for high PR blogs. The're all there in one place. In Google search box, enter "guest blog + your niche" to see what comes up. A few blogs in your niche that accept guest submissions should pop up.