Google assigned PR4 to my blog.

Yesterday I checked my google page rank and to my surprise I get PR 4. I think it has been assigned some time ago but I didn't check this for long time. Actually if you use some tool to check you google page rank you can get different results. On some tools I saw PR 3 and sometimes PR 4. The best way how to check your page rank is with Google toolbar integrated in Mozilla Firefox. I am very glad to have PR 4 and it has been already reflected in number of visitors coming from search engines.
Also I've tried to check which page rank StockWeb is heading to. And based on Google PR prediction tools is PR4 or PR5.