Hi ZmB!

I would highly suggest that you do not use any content more than once - regardless of your intentions with it.

If your goal is to build a valuable backlink to your money site, then why would you want to ruin the opportunity to do that by putting the links inside of content that will easily be flagged as duplicate?

Not only does this negate the value of the backlink itself, but it also paints a nice, juicy target on your domain as someone that's artificially trying to manipulate the search rankings.

If you're going to use duplicate content, ensure that it's on highly-trusted domains - similar to those you would find a press release. But regardless, I would stay away from it. You can get unique 500 word articles for a dollar if you look hard enough.

You can use spun articles in web 2.0s in tires.
Top article directories will not accept any spun,duplicate or quality less article.

True that. Any duplicate content regardless of your intentions will always hurt your site. There are lots of article writer/spinners out there. Go hire one.

If you use the web 2.0 property to promote your site and to get links from, then i would highly suggest that make use of unique and useful content only. And try to write the article on the recent updates and promote it. Or if you are not able to write article then hire someone, but provide unique content only.