OK...Following Ethan's comment and Moshe's reply about using this group to create a log/list of challenges and resolutions for Drupal implementations, here is a really simple one.
When displaying a node, how do I show the Organic Groups with which that node is associated, the way it's done on this site? I have OG installed on a couple of sites, but this feature doesn't seem to be provided out of the box. I'm guessing it's something that has been added to this GDO theme.
(NOTE: I will update this post with the Boston OG tag "HOW TO" when that becomes available. For now, I've just used the HOW TO site-wide tags.)
(BTW: Someone should consolidate the Sitewide tags: how to · how-to · howto)

Comments
See the template files that
See the template files that come with OG. Specifically the group post one. The variable you want is $node->og_groups_both. It is mentioned in the themeing section of the README. So yes, this requires a little custom code in D5. In D6, it is done for you by default.
actually, it's not done exactly this way
technically, when i post into a group using the d6 defaults and view the node, what i see is the full 'og box' which is all of the create content stuff - but not the name of the group itself (like in it's own little box), have i done something wrong in the default?
i'd love to stick a little 'posted in X group' below the title itself, that may be an easier approach for a site wide use on a community site...
$og_projects code for Drupal 5.x
This is more or less what we're using for Projectverse. It's for Drupal 5.x and goes in the node.tpl.php file.
<?php if ($submitted): ?><?php if ($og_groups): ?>
<!-- the post is submitted to a group -->
<?php
$og_projects = array();
foreach ($node->og_groups_both as $key => $name) {
$og_projects[] = l($name,'node/'.$key,array('class'=>'group'));
}
$og_projects = implode(', ',$og_projects);
?>
<span class="submitted">
<?php print $submitted ?>
<?php print $og_projects; ?>
</span>
<?php elseif (!$og_groups): ?>
<!-- the post is not submitted to a group -->
<span class="submitted">
<?php print $submitted ?>
</span>
<?php endif; ?>
<?php endif; ?>
with views
I was using a views block to do this, but it had the unfortunate effect of showing up even when empty. I'm using christefano's code now, but I'll attach the view definition if you want to use it for a content type that is always in a group perhaps.
EDIT: My attachment isn't saving. No views definitions today!