One of the things that we have worked hard on for SQL Server 2005 is providing an infrastrcuture for samples and Books On Line that allows us to do frequent updates, this has been driven by feedback and also the positive reaction to the quarterly updates we were doing for BOL in SQL 2000.

We just shipped the first set of updates and have been working on the next set, you can get the BOL update here, and the samples update here.