A 302 Temporary Redirect within a domain is a different case. Even though the opening question is about a cross-domain 302, I thought a section on the intra-domain 302 would be helpful. This is especially so because so many .
It is Temporary redirect read it all http://www.mattcutts.com/blog/seo-advice-discussing-302-redirects/
302 is a temporary redirect from one web page to to another. It is inadvisable generally from SEO perspective as it does not pass SEO benefits to the page being redirected to.