and stellar populations. Some very robust correlations between<br>
various galaxy structural properties, such as total luminosity,<br>
maximum circular velocity, and size show rather small scatter,<br>
hinting at well-regulated galaxy formation processes. A major<br>
challenge to understanding these scaling relations, and ultimately<br>
galaxy formation and evolution, is the elusive interplay between<br>
visible and dark matter. I will discuss the latest derivations<br>
of galaxy scaling relations and their link with modern<br>
cosmological models.