compatability level

i restored couple of databases from 2000 onto 2005.

Should i change the compatability level of these databases to 90?

Would it help/harm?

If your application has no issues with working against a SQL Server 2005 database I would definitely change the compatibility level to 90. This enables you to fully use the benefits of SQL Server 2005. Make sure you run the databases through the Upgrade Advisor first.|||upgrade advisor?|||Check out this link