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You get PR from sites linking to you. Now if you are ranking because of anchor text then changing your title away from that anchor text will hurt you with those words in the SERPS. But as far as toolbar PR goes your title does not affect it in any way.
I don’t think it’s anymore! Google may ignore links from unrelated sites ~ getting related inbound & outbound links would help to improve your SERPS & PR.
> But as far as toolbar PR goes your title does not affect it in any way.
I doubt that – if your index page is about Racing Cars & all the other pages are about agriculture then these is a good chance your other pages ‘d suffer from a poor PR.