Page rank for my site has gone down?

I wouldn't worry to much about the PR that it is showing. Sometimes that happens. Not meaning this in a bad way but a lot of people spend too much time working on PR. PR is only a small part of how well you are going to rank in Google. Mold your site around what your visiters what or need and work on getting good quality links using your anchor text and you will be fine. I have seen many sites with a very low PR rank very well, even higher then high PR sites.
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Link Building Services|Search Engine Marketing

Thats true. Shouldn't concentrate on Pagerank alone. there are many others which matters for a good ranking.