HAProxy seems very promising as a production use software loadbalancer. The only drawback with this solution is that one still has to use some extra piece of middleware to terminate a ssl session (stunnel, apache).

Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Keepalived On Debian Etch
http://www.howtoforge.com/haproxy_loadbalancer_debian_etch

Using HA Proxy with Amazon EC2
http://developer.amazonwebservices.com/connect/entry.jspa?externalID=1639&categoryID=100

haproxy documentation
http://haproxy.1wt.eu/download/1.2/doc/haproxy-en.txt

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