Why did I have a feeling that you would ask that? ;)
Configuring Effective Litigation Searches with Discovery Accelerator 6.0, 7.0 and 7.5.
http://support.veritas.com/docs/288130
You should also bookmark this link which contains the one above:
"Listing of Symantec Enterprise Vault (tm) 6.0, 7.0, 2007 and 8.0 Manuals and links to the respective TechNotes"
http://support.veritas.com/docs/277782
Some things for you to consider though...
The 8.0 version of the document has been updated regarding some of the base concepts so you should still look at that doc and if there is any similar content then then 8.0 version would be the better version to follow.
Also, If you want the enhanced features provided in Discovery Accelerator 8.0 (such as the Analytics features mentioend above) you will need to upgrade at least Discovery Accelerator. Discovery Accelerator 8.0 is supported with later service packs of Enterprise Vault 2007 so if upgrading your core Enterprise Vault server(s) right now is not an option then you could just upgrade Discovery Accelerator to v8.0 to get these enhanced features. Please look at the Compatabiity Chart (in the "Listing of Symantec Enterprise Vault (tm) 6.0, 7.0, 2007 and 8.0 Manuals and links to the respective TechNotes" technote above for a link to the Compatability Chart.