SQL Server 2008 RTM finally reaches it’s end of support tomorrow i.e. April 13, 2010. Here’s snippet from SQL Release Services team blog:
Product: SQL Server 2008 RTM
Mainstream Support End Date: 4/13/2010
Extended Support End Date: Not Applicable
So, you should be making plans to upgrade to SQL Server 2008 SP1 soon.
Link – Microsoft Product Support Lifecycle Page