We had some issues to implement the new SharePoint 2010 metadata management and
metadata navigation features, e.g. in case of the tagging procedure (no
content-based suggestions?) and tag navigation (tag cloud only, no tree-based or
alphabetical A-Z index / glossary navigation).

Now we have adressed these issues with some custom components found here:
www.layer2.de/.../Knowledge-Management-Suite-SharePoint-201\
0.aspx

We are looking for implementation partners, resellers or pilot customers, that
have similar experiences and could give any real-world feedback.