This information is for ones who use iframes or frames in your websites.
There is always a debate whether google indexes the page in iframes or a frame. Well.. I would say yes..
Still some may say that you need to still navigate to the iframe page using some links. Again I say that its not required.. Confused???
Its true and I personally experienced in the websites I was handling in my company. We had used iframes to show some affiliate marketing feeds. These iframe contents were served from a different server. One fine morning we found the index of these pages in google.
Again another question is does iframe pass PR? Yes is the answer, but it will be a diferent PR from the page it is embedded into. If a parent page is having 6 PR, you cannot take the iframe to pass the same 6 PR from a link on it. If you want to know how much is the PR of the included page, you need to open the iframe conent page in a browser and see the PR.
If somebody links to your site from a framed page and claims that the page is having 8 PR, you should not agree with him unless you find 8 PR for the iframe content page.
Any debates on this iframe and seo issue is greatly invited and you can post your views at SEO Forums