Drupal 7.x

So did with drupal finish as "openpublic""open atrium" of the open source web site code?
I want to study the others has completed website.

http://openatrium.com/
http://openpublicapp.com/

I've been trying to set up a Drupal 7 site with Organic Groups. Has anyone done this in production with the same functionality of a D6 / OG implementation? I'm new to Drupal, and I understand this is a volunteer effort. But, to get a site up and running, considering the lag in module development for D7, I'm wondering if I wouldn't be better off with D6?

Note: I'm new to drupal and love it.

I have two books:

'Pro drupal development' and 'drupal module development'. Good books.

How do I learn things like how to add table drag to a form? Or how to create my own form elements? Hours on google leads me to half written tutorials for drupal 4,5 or 6.

Do you guys just read the scant drupal documentation over and over?

I'm making great progress and am developing modules but drupal is so vast. I understand a learning curve but I just need to know where to go to learn!

I have a managed file path in /sites/default/files/some/path/myfile.extension

How do I get it's relative path if I have the fid?

I was using file_create_url(file_load($fid)) but it gives me the complete path: http://...

Thanks in advance!

I have attempted to manually upgrade Drupal 7 to 7.2 but cannot run the update script. It says PDOException: SQLSTATE[2300]: Integrity constraint violation: 1062 (name, type, filename, module, weight) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, ditto ditto etc, and a noumer of other errors.

Curious what the simple solution is to creating a View from taxonomy terms using Contextual Filters? Currently when I go to http://www.mysite.com/photo/editorial/jolene-spencer all photos tagged with "Jolene Spencer" appear. That's great except they appear in the form of node teasers rather than displaying the "Content: Photo" field I have specified. This is clearly not a view. :/

The taxonomy hierarchy is as follows: Photo(parent vocab term) > Editorial > Jolene Spencer.