Web服务提供商的负载均衡器

I have a Web Services provider (deployed in Tomcat 6). The web service provider is expected to receive a huge amount of requests so, I’d like to know what is –in your opinion and experience- the best way to balance loads? (the question assumes that if one Tomcat is not enough, another one will be added to the solution and thus the need for a load balancer).I have a Web Services provider (deployed in Tom