A WebmasterWorld thread asks if Google penalizes or blacklists domains that are parked domains. A parked domain is a domain that has little to no content on it, that is basically a in limbo and is just sitting idle with possibly ads on them and not much more.
The majority of folks in the thread say that Google does not penalize a domain that is a parked domain. It may not rank well for reasons such as not having many links to the page or not having much content on the page, but for being a parked domain - that alone most likely will not penalize or blacklist the site.
In fact, Tedster said Google helps monetize parked domains with Domain Park. It is a Google AdSense product for parked domains. Domain park is a very controversial Google product, but that is for another debate.
Forum discussion at WebmasterWorld.
This post was written on September 11th and scheduled to be posted on September 14th.