What does the 2008 mean in the ISO 9001:2008 standard? Is this different that ISO 9001:2000?

The ISO 9001 standard is reviewed and revised for improvements about every 7 years.  The revisions ensure the standard is reflective to current business operations.  The 2000 or 2008 are the revision dates.  Currently the ISO 9001:2008 standard is the revision that all companies are certified against.