I admit that this is the first time I have heard of Server Name Indication, or SNI, for securing virtual hosts. I am glad to have found a tutorial on how to use SNI with Apache via mod_gnutls module. Whilst I plan on applying this on one of the servers I maintain, the fact that mod_gnutls is still experimental prevents me from doing so. However, it is an exercise that is worth your time. At least when the module gets into production level, you already know what to do.