I have a few blogs at blogger. One is now getting traffic and adsense clicks and I want to transfer it to my own domain. Any suggestions how to transfer some of the content without being penalized by Google for duplicate content?
Since you can't 301 redirect your going to take a hit regardless, you need to use the Google Webmasters Central URL removal tool. Remove the old pages\urls before you add them to your other site, I'm not sure if there is a way to properly 301 redirect with blogger hosted blogs.
What he said^ You may just have to remove all your old posts and make a new post saying that you have moved... then after a couple days go back to google and submit your url. After submitting to google remove your blogger within 24 hours. In other words, maybe you should not submit to google till you have transfered all of your old visitors.