Humm, I don't really have any. I have a 620 Kodak Duaflex my fiance got me but I'm not really into the Lomography thing, but I do get a roll of respooled 620 and play with it occasionally. I also have (one) 35mm point and shoot but that either goes with her on trips or is kept in the car for an "as needed any time" camera.
I use my 35mm gear. I use my Yashica TLR and I just bought a Mamiya 645 Pro that I'm having fun playing with and expect to use. I certainly use my 4x5, although not as much as I might like because, well, it's an endeavor in its own right rather than something to take along while doing anything else.