It is possible to tool
Are now there any gear allow to measure PR with the 20-30 websites at once
There are numerous tools this way.Here is one of these:
http://www.iwebtool.com/multirank
http://webrank.nabaza.net/
WebCEO includes this feature inside it, Also in the event you get firefox SEO plugin it will tell you the pr of your page while in the google outcome – so its easier to find pr links.