currently pagerank 2, but you can't really trust the toolbar,
google hardly ever changes
PR for the toolbar, however they do change
PR with their internal system, so if you start seeing good SERPs when you search for keywords which relate to your website, then you know your website is starting to do well
BTW don't trust thoes traffic predictions things, its like going to a fortune teller and asking them to tell you if you'll get rich in the future. No one can predict what google will do because its more than just the number of backlinks. There are alot of other factors, such as quality of links, relevance, if the linked site is a spam site, if the site being linked is new or old, really old sites gets a boost, really new sites gets a small boost, etc etc
way too many factors
a jump from 0 to 6 is like .. magical, because a page rank 6 site is really hard to get, but then again, good things sometimes happen to good people