Just wanted to let you all know about a kick ass new program I stumbled upon called Usine (No, I'm in no way affiliated, just passing this on). It's a lot like EnergyXT, except that it is completely modular. You can for example use math processors and the like to automate vst plugin parameters, or even use 1 plugins parameters to automate another plugins parameters (i.e. change the volume on Plugin A (VSTi of your choice), which outputs a value to adjust the frequency of Plugin B's filter, which in turn send's a value to Plugin C's chorus rate parameter, and so on). Completely mind boggling the sounds you can create. I have waited a LONG time for a program like this, and best of all it's free (Donating $ gives you some additional materials I guess). Everyone who is into sound design, or just wants a an ultra-flexible hosting environment for their plugins should go get this one. A little confusing on somethings when I first used it, but manual is pretty good, and I think they have forums too.
USINE: http://www.sensomusic.com/usine/
USINE: http://www.sensomusic.com/usine/