Tam Tam is the first Dutch Microsoft partner with search specialization. We've been working with Ontolica search for MOSS 2007 for a while now. The product solves many of the usability issues that the default MOSS search center is coping with. For example, drilldown, boolean search and a well thought user interface, are a few examples that make Ontolica a good option for enterprise search.
Although a lot fo things going on about search at Microsoft, and the effort being made in the community, Ontolica added some valuable features in version 3.2 which makes the product worth looking at.
Feature Overview - key features in Ontolica for MOSS 2007
Added features in Ontolica 3.2 (released September 14):
