I had always stuck to [dbo] until I started architecting our data warehouse/BI strategy, and I am using schema to manage the project boundaries between the various ETL jobs that pull from different parts of the business - putting all the relevant objects in the [mfg], [bud], [inv], [sls], etc. schema (with shared objects/functions in [ref] or [dbo]) is really helping to keep developers from stepping on too many toes, and allows shorter names because the schema helps to define the object. 

I'm a convert.