we cannot have any non-clustered index if we don't have a clustered index on a table....also a primary key is by default clustered indexed and by definition unique.....

well...from your discussion I got that you need to retrieve data as fast as a clustered index but in different ways.....MS is clever enough to let you features to handle situations like this.......if all the columns required in a query is present in a non-clustered index the SQL server fetches the values from the NC index pool itself. It does not require to go to the main table. Also, we can include columns in NC indexes which also has the same effect. NC indexes are more versatile than indexed views.

Hope this helps.....