The services offered include forums to enable shared learning and mutual support, tutorials and documentation for new technology, and troubleshooting of problematic or systemic failure modes. We describe these sometimes successful and sometimes not so successful experiences and analyze lessons learned that are helping us improve our services. For other smaller communities and individual users the OSG provides consulting and technical services through the User Support area. The LHC user community has deep local support within the experiments. The Open Science Grid (OSG) supports a diverse community of new and existing users in adopting and making effective use of the Distributed High Throughput Computing (DHTC) model.