SQL Server 2005 or SQL Server 2008

Question

Hi guys,
I am new to SQL server and would like to take a MS certified course and have 2 questions.
1. Is SQL Server 2005 or SQL Server 2008 higher in demand? I was told SQL server 2005, but judging by version 2008 looks better and I need conversion course for 2005 to 2008.
2. I am also pondering about MS Business Intelligence Developer or Database Developer course. I like BI concepts but I was told Database developer can get a job easier. Pls give your opinions.
Wei