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Have you done anything funny that would warrant your site being removed? Google only notifies webmasters of manual penalties if I am not mistaken.

Hi Paul, The difference would be made how you plan to use these domains, if they are going to inter-link to each other, they may be seen as Link-wheel  strategy (black hat strategy). If they are competing for same industry space (as in keywords) or working to benefit the same company together, then again that may be a problem. As for the same IP, there are several websites hosted on same server IP at a time. I hope this helps, please respond if you have further questions. Regards, Vijay

Hi Paul, What Bernadette says has a lot of truth. Even, there's been some recently changes in 3xx redirection rules. And a great professional (Cyrus Shepard) wrote a nice piece of text about that in the Moz Blog. Check it out! 301 Redirects Rules Change: What You Need to Know for SEO In my opinion, historically 301 are better than 302, if you can set 301, do it. Best Luck. GR.

There is nothing "bad practices" about allowing a non-existent page to 404. People often times forget that a 404 isn't a signal that something is broken and needs fixing, its just a status code that returns "Not Found". Sometimes it makes sense for things not to be found on your site because they were never there in the first place. 404s eventually stop being crawled and indexed. You shouldn't just bulk redirect things to your homepage though. Its always best to have a 301 point to the most relevant page based on what the original page was. If there is no most relevant page, have you considered 301-ing them to one step up in the site navigation? (i.e. a category page or hub page)

Hi there I would be extremely careful here, according to Google this would be considered a link scheme. One of the examples are as follows: Widely distributed links in the footers or templates of various sites While I understand your intentions are good, this is an old link tactic that Google and other search engines caught on to awhile back. I would recommend against it and instead focusing on brand building via content, SEO, and other opportunities. Let me know if this helps or doesn't make sense. Good luck! Patrick