A review is given on our recent microwave results in chaotic systems with s
pecial emphasis on examples having a direct relevance for real mesoscopic s
ystems. We present tests of predictions by Simons and Altshuler on velocity
distributions of different types of spectral level dynamics, studies of tr
ansmission fluctuations through open billiards, and of the localization-del
ocalization transition of wave functions in disordered systems. The review
ends with a presentation of chaotic field distributions in three-dimensiona
l billiards. (C) 2001 Elsevier Science B.V. All rights reserved.