In a large saute pan, heat olive oil over medium heat, add pancetta, and cook, stirring frequently, for 5-6 minutes. Turn heat to low, add garlic, and cook another minute or two.
Turn heat to medium-low, add zucchini, salt, and pepper, and cook, stirring occasionally, for about 30 minutes.
Meanwhile, boil pasta water and cook linguine according to directions on package. Drain, reserving about a half-cup of the cooking liquid.
When linguine is almost done, add cherry tomatoes and radicchio to the zucchini, and cook until radicchio is just wilted. Add creme fraiche and herbs, and cook until thickened.
Add drained linguine to the zucchini sauce, and if sauce is too thick, add some of the reserved pasta water. Stir until pasta and sauce are well incorporated. Just before serving, top with grated parmesan.