[Alfa1]

Google specifically asks webmasters to give Googlebot access to restricted pages. I have seen this at various Google webmaster blogs and webmaster help pages. However, you must show the whole access page/thread to the visitors. Any other pages may be restricted from the visitors.

See here:
http://googlewebmastercentral.blogsp...eb-search.html

Webmasters wishing to implement First Click Free should follow these guidelines:

• All users who click a Google search result to arrive at your site should be allowed to see the full text of the content they're trying to access.
• The page displayed to all users who visit from Google must be identical to the content that is shown to Googlebot.
• If a user clicks to a multi-page article, the user must be able to view the entire article. To allow this, you could display all of the content on a single page—you would need to do this for both Googlebot and for users. Alternately, you could use cookies to make sure that a user can visit each page of a multi-page article before being asked for registration or payment.

First Click Free is also what webmasterworld.com is using.

I hope this clears it up.

Ziki would you consider to add First Click Free functionality?