There are spatial data features for MS Sql Server 2005?

Question

I wonder if there is any optimization I can do to achieve faster SELECTs for spatial data without moving to SQL SERVER 2008. There is for SQL Server 2005, natively or through plugins, any of the features below?

1. Spatial field types
2. Spatial indexes
3. Arcsin math function for surface distance calculation on a sphere (Earth)

Answer 1

There are some GIS features available through http://www.codeplex.com/Wiki/View.aspx?ProjectName=MsSqlSpatial but as far as I know SQL 2008 is the way to go