Even though the page rank in the google toolbar is not 100% accurate you can use it as a guideline to the value Google give the webpage. It is not useless...

Hi
page rank is important as it represents goodwill of your website. But it doesn't effect your rankings and business.

i think it is only important when you are selling your domain or exchanging links

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i think high quality very importance my site
has not much backlink but each one quite good quality.
I mean both domain and page that appear my site.

PageRank is just one way how Google rank websites in SERP, the second one is HyperText Matching analysis which involves your targeted keywords. You may want to read the full article here - Google Technology Overview.

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If you are looking for good page rank in Google then You should be try to got quality inbound links from relevant websites. I think website position against your targeted keywords is more important as compared to Google page rank.

Last time Google update page rank on 30 October.