A lot of color films. Kodak Portra 160 and 400 for negatives, and Fuji Provia 100F and 400X and Kodak E200 for chromes.
I'm experimenting a lot with cross processing - mostly C-41 films in E-6 chemistry. I did this with both of the newer Portra films and an expired roll of Portra 160VC exposed at 64. Not the best look for every subject, but very interesting effects nonetheless!