Sometimes your internal pages have more PR then that of the homepage. Now the Question arise how to findout which page have how much PageRank ? Its nearly impossible to open each and every page if u have a dynamic website.
Okay here is the tool:
http://www.livepr.info/internal-pages-page-rank3.php
Umm .. the bad-side of this tool is .. it works once in 24 hours .. Lol 
If you find your luck hard with the above tool then it is recommended to use SEOQuake Plugin and run a Site:YourDomain.Com command at Google, It will show you all the pages with PR, Backlinks of Yahoo + Google and alot of other useful info !!
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Nice tool, it worked for me.
Thank you. It works. How could I know it before?!