Sending an email to IFTTT is probably the fastest way to interact with IFTTT anyway so no need for a plugin there. That leaves trying to find a way to get info from IFTTT back to VoxCommando.
IFTTT doesn't seem to offer an API yet to the "small folk" like us.
But I have an idea. I'm thinking that you can use recipes with IFTTT to save text files to your local PC via dropbox.
I can create a plugin that will monitor a folder for text files and when they appear, open them and execute the text inside as actions the same way we would evaluate any other string sent by UDP, HTTP etc. (see
http://voxcommando.com/mediawiki/index.php?title=API_Application_Programming_Interface)
Since IFTTT is already super slow to send updates, the additional time for DropBox to create the file and then have VC discover and read it becomes pretty insignificant.
Basically it's a work-around that will pretty much do anything a full-fledged plugin would do anyway and just as easily. The only downside (if you see it that way) is that you need to use DropBox . I already use DropBox so that's not an issue for me.
By the way, controlling your lights by sending emails to IFTTT is fine if that is your only option, but the chances are pretty good that there is a way for VoxCommando to interact directly with your home-automation kit with much less of a delay. Asking VC to turn on the lights and then having to wait (how long... 5 to 30 seconds?) is far from ideal.