The past decade has seen an explosion in the number and diversity of exoplanets known, and in the level of detail in which we can characterise them. Transiting planets in particular offer a fascinating window into the structure and atmosphere of these new worlds, giving rise to spectacular results over the past few years: transiting Super Earths, temperature maps, hazes and other absorbers in hot Jupiters. The more sensitive we become, the more important sources of red noise, wether instrumental or astrophysical (stellar activity) become. In my talk I will outline some of the key discoveries of the past few years, and illustrate the importance of red noise using selected examples, before sketching out some promising areas for future developments.