Topics in the backward compatibility section describe changes in the behavior of full-text search between SQL Server 2005 and SQL Server 2008.
Deprecated Full-Text Search Features in SQL Server 2008
Deprecated full-text search features in this release.
Discontinued Full-Text Search Features in SQL Server 2008
Discontinued full-text search features in this release.
Breaking Changes to Full-Text Search in SQL Server 2008
Full-text search changes that might require changes to applications.
Behavior Changes to Full-Text Search in SQL Server 2008
Other changes in behavior to full-text search.