Hey folks,
There's a new plugin available from Wavesfactory (maker of many sample libraries, not to be confused with the big plugin vendor Waves) called TrackSpacer. It automatically detects frequencies in a track and applies EQ to another track via sidechain to reduce those frequencies most prominent in the first track, thus making room for both tracks in the mix.
For example, you probably know about the "ducking" technique where you apply compression to a track based on the level of another track. This is usually done with a sidechain input to a compressor on the target track. TrackSpacer is similar, but applies EQ instead of compression so that the two tracks don't step on each other. It's a interesting idea, one that I haven't seen implemented in a plugin before. Of course, you can do this manually by automating EQ levels, but that's a lot of work. This plugin applies EQ dynamically, in real time, so it goes much further than just notching out a static EQ band in a track.
I haven't tried it yet myself, but I thought some of you plugin junkies might want to give this a look. :-)
http://plugins.wavesfactory.com/ Note: no affiliation, just a customer.
Cheers,
Eddie
Edit: added link