If you're lucky enough to have upgraded your production Enterprise Vault environment to Enterprise Vault 11, you will have started to get used to the new Enterprise Vault Search interface. Even if you haven't upgraded your main environment perhaps you've been playing with Enterprise Vault 11 in a lab?
The new Search interface is certainly a big boost on the previous offerings, it begins to make use of the new indexing engine which was delivered in Enterprise Vault 10 and gives a big boost in look-and-feel.
Today I spotted a helpful article on the Symantec Technote RSS feed which helps you (and end users too perhaps) get used to the query language syntax. Take a look: http://www.symantec.com/docs/HOWTO100099