Page Rank Zero - Is my site being penalized?

[Rikardao]

I see a PR0 on an entire site and I wonder if this has to do with some links coming from a blog we created.
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We have created a company website and blog with many channels in drupal. Each channel is linking to one of our sites which are in another server and another url

example: there is the site A which is the company site and blog linking to sites B, C, D, E in another server.

Because they are in a different IP, is this considered link farm?

When the PR is whited out...0/10 - Not N/A - does it mean the site is being penalized?

[courier]

Has there been any drop in your position in the results?

[piatkow]

Has the PR dropped to zero or was it zero when first checked?
Is the site ranking well in the SERPS?

I have created niche sites that ranked in the top 3 for key terms despite low PR. I wouldn't even bother checking it unless I was trying to rank for an ultra competitive search arguement. What the punters see are the SERPS and that is what brings your visitors.