I like to run integrity checks against my databases very regularly, sometimes daily if I can get away with it. For some of the larger databases that I manage I change how this is run but on my consolidated instances which can house several different smaller databases I run the following script in a job and schedule the job to  run daily, out of hours, using the SQL Server agent. My script looks something like this:

--Gethyn Ellis  April 2009
--runs DBCC checkdb against ALL databases on a server
--Needs to be run against master database i.e. that is where sp_MSForEachdb is found
--To exclude a database add the database name to the NOT IN list in @cmd1
DECLARE @cmd1 VARCHAR(500)


SET @cmd1 = 'if ''?'' NOT IN (''tempdb'')  DBCC CHECKDB([?]) WITH NO_INFOMSGS'
EXEC sp_MSforeachdb @command1 = @cmd1