What I understand as of now: Google does crawl iframes, but attributes the SEO value of the content within them to their original site. (Let me know if I'm mistaken.)
What I need to know: If I were to iframe a section of a beta3.domainname.com site into a domainname.com site, does this beta3 attribute any SEO value to the domainname.com site?
Essentially - Does good content on a from a beta3.domainname.com (which is mainly just a naked piece of content) bring any benefit to the domainname.com version of the site when it is iframed into the domainname.com site?