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Best practice is to NEVER post the same content on 2 or more different sites.  It is considered duplicate content and although you may not get a penalty the Fox is right when he says that one site will win over the other and chances are you  will lose unless you have a better page rank and authority than tumblr...

The only way for what you want to do to work is to be able to add REL=author attribute as well as microdata (HTML 5) distinguishing who owns the original content (yours) to the tumblr content.  and that's not happening...

Tumblr is great for quick posting with links back to your site, try and create a brand for yourself...

Good luck

I have read the FAQs and checked for similar issues: YES
My site's URL (web address) is:http://www.recoveryconnection.org/
Description (including timeline of any changes made):n mid-June, we were penalized. We received a message in WMT that our site was penalized for Doorway Pages, thin content, and pages trying to rank for just 1 KW.

1. We removed all doorway-style pages (according to guidelines) and consolidated content to target no less than 3 KWs per page, and not over-optimized.
2. Submitted first reconsideration request.
3. Denied 8 days later via MSG in WMT that stated simply that the site still did not meet Google's Guidelines.
4. Printed fresh copies of Google's guidelines, and rewrote almost every page of the site. We took down the blog in case of old thin content or possible doorway pages. We reduced the overall size of the site from over 400 pages down to around 80.
5. Submitted 2nd reconsideration request.
6. Denied 10 days later via MSG in WMT that stated simply that the site STILL did NOT meet Google's Guidelines.
7. Restructured site and it's content.
8. Denied 3rd time.

http://www.google.com/support/forum/p/Webmasters/thread?tid=43c09330ab7b25b5&hl=en

Note: We have checked our link profile over and over, and we have NO Paid links. We have moved our entire site to a new platform, with clean code, new URL structure, etc.

Does anyone have any feedback?

Thanks.

I have read the FAQs and checked for similar issues: YES / NO
My site's URL (web address) is:www.recoveryconnection.org
Description (including timeline of any changes made):

We were hit with the Doorway Pages penalty on 5/26/11. We have a team of copywriters, and a fast-working dev dept., so we were able to correct what we thought the problem was, "targeting one-keyword per page" and thin content. (according to Google)

Plan of action: To consolidate "like" keywords/content onto pages that were getting the most traffic and 404d the pages with the thin content and that were targeting singular keywords per page.

We submitted a board approved reconsideration request on 6/8/11 and received the 2nd message (below) on 6/16/11.

***NOTE:The site was originally designed by the OLD marketing team who was let go, and we are the NEW team trying to clean up their mess. We are now resorting to going through Google's general guidelines page. Help would be appreciated. Below is the message we received back.

Dear site owner or webmaster of http://www.recoveryconnection.org/,

We received a request from a site owner to reconsider http://www.recoveryconnection.org/ for compliance with Google's Webmaster Guidelines.

We've reviewed your site and we believe that some or all of your pages still violate our quality guidelines.

In order to preserve the quality of our search engine, pages from http://www.recoveryconnection.org/ may not appear or may not rank as highly in Google's search results, or may otherwise be considered to be less trustworthy than sites which follow the quality guidelines.

If you wish to be reconsidered again, please correct or remove all pages that are outside our quality guidelines. When such changes have been made, please visit https://www.google.com/webmasters/tools/reconsideration?hl=en and resubmit your site for reconsideration.

If you have additional questions about how to resolve this issue, please see our Webmaster Help Forum for support.

Sincerely,

Google Search Quality Team

Any help is welcome. Thanks