The TRAPPIST-1 planetary system, with its seven planets transiting a nearby ultracool dwarf star, offers the unique opportunity to perform comparative exoplanetology of temperate Earth-sized worlds. To further advance our understanding of these planets' compositions, energy budgets, and dynamics, we are conducting an intensive photometric monitoring campaign of the system using both ground-based and space-based facilities. Most notably, we have now more than tripled the number of transit events observed with the SpitzerSpace Telescope on TRAPPIST-1 with respect to what has been presented in the original discovery paper. In this talk, I will describe our observing campaign and its current results. I will then discuss how these results improve our understanding of the TRAPPIST-1 system and help prepare the detailed atmospheric characterization of its planets with the upcoming James Webb Space Telescope.