Drupal -- the open-source Community Platform + Web CMS -- is officially trendy. How do I know that? Well, a short while back, within one week two people came up to me separately during meetings to express how "cool" Drupal is. What both people had in common was that neither of them had ever seen, let alone used, Drupal.
When a technology platform achieves that degree of cool factor, it means a bandwagon has started rolling. Last year it was SharePoint. This year it's Drupal. Whatever the platform's strengths, however, not all is well on the Drupal bandwagon. If you try to jump on and miss ... well, you might get run over.
Drupal boasts significant merits. It's an interesting combination of community Web-site-in-a-box and conventional Web publishing platform. Drupal has attracted the interest and expertise of integration firms large and small. It boasts a vibrant ecosystem producing a nearly bottomless collection of add-on modules. Drupal is open source and written in (the very accessible) PHP.