1 - To improve you ranking you need to use your keywords. SEO related blogs are probably less bothered about keyword comments as they understand what you're upto (just make sure you write a decent comment that will get approved).
2 - Doesn't make a bit of difference but you may end up making contacts in the same niche etc if its on topic which will benefit you in the long run. I've also ended up with people following comments on a few occasions from related blogs and making purchases.
3 - There's some software to do this Comment Kahuna | Free Link Building Software or Attract FREE Targeted Traffic | Backlinks | Comment Hut | Incoming Links are two free examples.
Good luck with the commenting! :tup
Mike
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