I’ll start it off…
Vestax Controller One turntable/instrument through ring mod and murf (murf not pictured). [/img]
My LP, of course! http://www.flickr.com/photos/32147775@N08/3181671198/sizes/l/ 
Anything and everything.
When I got my FreqBox, the first thing I tried was playing my tenor sax through it. It worked out fairly well, but certain notes would “stick out” more than others, having a harder distorted edge to them, while 3/4 of the other pitches sounded smooth. That’s just the nature of hard sync.
My favorite thing to hook up to the Foogers is my ES-1 Electribe sampler - especially sending the Left signal out to the Freq to generate a signal on the Envelope Follower, then sending the Right channel out as audio to be processed by whatever.
vocals, guitar, computer keyboards, and other foogers 
Guitar, vocal, computer synths (Reaktor especially), Korg M3, several special effects samples played directly from the Korg or from Ableton Live sometimes processed from Live as well and fooger to fooger and also a few other stomp boxes.
drums and vocals primarily, followed by my synths. the mf-107 actually gets a lot more use as an extra oscillator for my phatty or xs than as an effects pedal. 
Ive run vocals, keyboards, drum machines, through ringmods and delays. I never tried to run my sax through anything yet. (Ringmod would be cool)
I like running a RHodes through Frexbox and RInd Mod. I also have never tried running a trumpet through anything either.
Eric
I have been using my MF-101 low pass filter with my Goldtone Dojo DLX which is an electric banjo crossed with a dobro. I use Classical Indian tuning for this instrument. Hope you enjoy the sound.
Here is a link to a video of the Dojo and Moogerfooger
http://www.youtube.com/watch?v=TRpse1rrERc
King Tet
kingtet, I’ve never seen one of those before, but if I could play banjo or guitar well, I’d definitely want one! The dojo is AWESOME! 
Wow that’s an interesting instrument. Do you play any other instruments that use the same tuning, or did you just learn/adapt to it only for the Dojo?
Honestly what is a little more interesting to me at the moment.. and a little off-topic.. and weird… is that I know the layout of that livingroom… Im damn near positive that I spent many of my younger years in the same complex of single family homes called Portofino, right next to ‘Serra High School’ that this video was shot in. Ive never seen or heard of the guy but my mom owns a few houses there that she rents- and I lived in the exact same model for many years, as did many of my friends.
Maybe he lives in North Dakota or something and Im way off… but after watching that video, I would be money that I lived in the same area haha.. what a trip
Nice Video. Clearly, the MF-101 works really well with this sound. It’s subtle but there and someone just listening to this would probably not know that the sound is filtered which to me is the best kind of effect.
Only my keyboard instruments, my Rhodes is always connected to the Ring Modulator for vibrato and the Phaser and Delay are connected to my auxiliary outputs on the mixer but I only use them to spice up my synths.
Mostly one of my gongs but also a waterphone and prepared snare drum. Every now and then it sees the output of my LP. Percussion and Moogerfogers are made for each other.
Dean
I want to try a Mellotron into a MURF / Phaser / Analog delay. It could be fun.
Hand Drum and moogerfooger!
Very few rigs would be this awesome.
My 5-string Zeta jazz violin! The ability to control the note volume with bow pressure on the strings allows me to “play the filter” on the MF-101. The “tuba” setting from the manual is mind blowing, btw! Of course I patch that into the MF-103 Phaser for some swirly goodness, now just experimenting with the envelope out from the 101 as a CV for the 103. The MuRF and analog delay are next! Boss pedals only wish they were this cool!!
So far I’ve connected my MF-101 to the following
Mic: Works great
Novation BassStation rack: Eh, sort of worked, but I’m having trouble with space in my setup to get it routed to my mixer properly
Novation X-Station: Worked great
Korg EM-1: Kind of worked, but not as I was expecting it to
I’ll need to collect some more moogerfoogers asap to explore the possibilities…
I recently ran a grand piano through my foogers. That was awesomely swirly and kinda like a rhodes, if a rhodes was a grand piano. Also violin through a freqbox yields a fairly convincing angry cat sound.