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Vote for Loadbalancer.org Enterprise
The Loadbalancer.org appliance Enterprise helps scale up your web site. Place two Loadbalancer.org appliances (in fail-over mode) between your firewall and your web servers. All web requests are handled by the load balancer and dispatched to individual web servers based on the scheduling algorithm you select. If any web server fails a health check it is immediately taken out of the cluster so that your customers are not affected.
Available on the hardware platform of your choice: 3 million+ concurrent connections. Ideal for large critical environments. Cluster ready, all the configuration on the master is auto-replicated to the slave.