It depends on how the redirects are done.
If you are doing a 301 redirect then you are telling the search engine the site has permanatly moved to a new location and in most instances, the major search engines will simply index the content at the new site and drop the the old site from the "visible" SERP's.
If you are doing a 302 redirect then you are telling the search engine/browser the site has move temporarily to a new location and this create numerous problems as the search engine can have trouble indexing the correct url... DO NOT USE 302.
Therefore, providing you are doing a 301 redirect then you should be fine.
However, if you are thinking about url forwarding then this is generally done via a 302 which is bad
So, in summation, doing a 301 redirect on other domains is ok (providing its not an pre-existing domain with a decent
PR and site being redirected doesn't have the same or similar content)