There isn't a specific conversion process that you have to do. Once you add the 2000 database to a 2005 server either by restore or attach, the server will go through an "upgrade" process to convert the db to 2005. This process is very brief compared to the upgrade from 6.5 to 7.0.
Install and use SQL Server Upgrade Advisor for that purpose. I recommend downloading the tool rather than using the version on the distribution media since u can then be sure that using the latest edition. Install the tool to a client machine rather than to a production database server. While Upgrade Advisor does not make any changes to your configuration. Start the Upgrade Advisor by going to Start > All Programs > SQL Server 2005 > SQL erver 2005 Upgrade. Rest is <a href=”http://searchsqlserver.techtarget.com/tutorial/Step-by-Step-Guide-Migrating-to-SQL-Server-2005-with-Copy-Database-Wizard”>HERE</a> and also see <a href=”http://support.microsoft.com/kb/224071″>HERE</a>