If your using a blog to help search engine results you don't want to display it in an iframe. Here's what Google says about iframes (
http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=72746#4):
Quote:
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We recommend that you avoid the use of iFrames to display content. If you do include iFrames, make sure to provide additional text-based links to the content they display, so that Googlebot can crawl and index this content.
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