Can have different or same database.

Yes, you can register, delete users, save profiles, block/activate/deactivate users in either Joomla or phpBB frontend or backend. Another user will be also changed.

My phpbb3 and my joomla database aren't the same, so can your component work with this configuration?

Yes

If an user register in joomla or in phpbb3 it will store in joomla database and in phpbb3 database?

Yes

1.Will Google CSE search only the menus we specify ? What about articles that are not accessed through menus ( eg using customized modules that which allow embedding of articles ) etc It searchs either the menu item if selected, or all indexed pages from the site (if All is selected) 2. Is there a ...

Yes, you can move the contents and edit configuration.php to adjust paths

It is fine for testing but live site should be in the root.
In fact /folder should work as usual, but we are still testing this.

http://alterbrains.com/images/extensions/gsearch.png Search different areas of your website using Google custom search engine. Ideal search solution for big websites. Supports fluid template width. Search module can search all menu items content or only by specific menu item. Search results look ca...

It is almoust ready, testing now... 8) The problem is that it is impossible to synch friends from JomSocial to phpBB. Right now if you add/remove friend in phpBB - this friend is also added/removed from your JS account (you can also setup 'Auto-approve phpBB friends' setting). But JS doesn't have ab...

Sulley wrote:Where the 'latest posts', 'my posts' will be displayed? Will it go to phpbb or they'll be showed within jomsocial's profile page?

It will go to phpBB.

We are finishing the advanced JomSocial integration, please feel free to discuss your thoughts here.
Integration now have synchronization of profile fields, avatars, we have also added the tabs to profile: