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From the Acquia website:
Single vendor for complete Drupal infrastructure support
Acquia is your one-stop shop for maintenance and support for your entire Drupal infrastructure. We’ll keep your Drupal and LAMP stack secure, up-to-date and performing to meet your business requirements. Best of all, there’s only one number to call when you need support.
Highly available, high performance architecture
Eliminate unexpected site downtime with our clustered, multi-tier cloud-based architecture. Our servers with load balancing and built-in redundancy ensure your Drupal site will meet your scalability and performance requirements.
Integrated with your development workflow
Integrate your development and deployment processes to Acquia Hosting with hosted SVN repositories for code management, on-demand staging environments for testing and automated deployment to production instances.
You can learn more about this product at Acquia's product page.