Google use a Page Rank scale of 1-10 to give an indication of the popularity of web pages. The scale is logarithmic in nature which means that page rank 3 for instance is ten times greater than page rank 2. After a reshuffle over Christmas DBS has received page rank 5.
David Clarke of DBS says "although we are pleased to continually improve our page rank we're more concerned where our pages and our clients' pages rank. Don't obsess about Google Page Rank - it's a fun toy and a good indicator of the general health of your website but it is not the main factor that determines where your pages will rank in search engine results."