awesome

In one word: Awesome.

This Drupal distribution truly displays the beauty and power of Drupal—a dedicated team over at Development Seed spent a lot of time making a great Intranet-in-a-box solution built on top of Drupal, and even though it's a simple set of modules and an installation profile, you'd have to do a little digging to tell if an Open Atrium site even runs on Drupal!

I've just been tinkering with it for a local nonprofit I help with, and I see a lot of potential. In less than 20 minutes (from the download of the tgz file), I had two groups, eight users, and a calendar/wiki/blog system running for everyone. It's drop-dead simple! If you're tasked with building an internal communications site, or a full-fledged Intranet, this is probably one of the easiest/best (and most free) solutions out there. Check it out!

There are only two or three Drupal modules that I have installed on every single Drupal site I set up. At the top of this short list is Global Redirect. There are many reasons for its existence, not the least of which is Search Engine Optimization. Global Redirect does such niceties as remove slashes from the end of URLs and makes sure the home page of the site is the standard home page, and not an alias to it (like /front, or /home-page).

Basically, the module is an "SEO-in-a-box" module; sure there are other things you should do to get your Drupal site more optimized, but this module is like the icing on the cake for Drupal. It makes sure that all links to the site will direct to one, and only one link. That way, people copying out a link to a certain page on your site always get the same link, thus boosting your pagerank.

But this module earns kudos from me for more than that reason alone; it goes one further and does something that almost no other Drupal modules do: makes life simple. Download the module, copy it to your server, enable it, and you're done. The default settings are sensible, non-intrusive, and just. work. If only other modules were so nice!

It does only a few things, but it does them <almost> perfectly [see comment by You below], and makes certain aspects of SEO dead simple.

Unless you're doing some special URL re-writing on your site (i.e. more than just using Pathauto and Path), you should have this module installed on your public-facing Drupal sites.

Read more on SEO with Drupal: Search Engine Optimization with Drupal [From Webmaster Tips].