Do search engines penalize domain registrars?

My PR may be getting dinged

[sriver]

My PR on a few sites has been declining (on one site it went from 5 to 0) and google doesn't seem to crawl some pages. I'm wondering a few things:

- If Google (or other SEs) doesn't like my domain registrar.

- If Google doesn't like one of my sites and dings all other sites that are under my name (with the same registrar).

- If Google sees that i have some domains that redirect to other domains and dings me for that.

I created a site for another party (they bought and hosted the domain on another registrar) and with only a few incoming links (according to google) they are already at PR 5.

Anyone have ideas about this? Or, does anyone know of domain registrars that google likes (if that, in fact, is the problem)?

Thanks

[Webwork]

I've yet to read a credible report - or even any other version of report - that backs up the idea that registrar alone is sufficient nexus for a penalty.

Now, if you used a particular registrar and then hosted on that registrar's servers, which servers might share IP addresses and host a variety of bad players on those IP addresses with your website(s) and if you employed identity masking on your domains and if your domains linked into any nearby bad neighborhoods and . . .

Registrar alone? Haven't come across that one yet, but maybe some day.

[davezan]

I wonder if Google's being a registrar has anything to do with it. :P