The Once and Future Lock-In
Enterprise Content Management (ECM) is not going to win any prizes for excitement, but it's important: it's a matter of how companies keep all their organisational stuff these days. So this piece warning about Microsoft's attempt to lock users into its standards at the content repository level makes a good point.
And as it also points out, there's now plenty of open source ECM software out there: Alfresco, eZ Publish, Joomla, Mambo, Midgard, Plone - so there's really no reason to take the one-way road to Redmond.