Top hair trends:
Hair colors: warm colors with red/orange undertones. or cold washed out browns, or really dark cold browns, and black.
Hair cuts: classic americana cut past shoulder lenght a la Hilary Rhoda, very short a la Maria Carla Boscono, the Patricia Schmid cut and as seen on Olya, the Rachel Alexander cut. Bangs are officially a major trend, thanks to model Irina Lazareanu
hilary rhoda ss07 at la perla
the short
mc boscono ss07 cut as seen on tasha tilberg (and cecilia, agnyess...)
the irina bangs ss07
the schmid cut ss07
the olya cut ss07
the rachel alexander cut ss07 as seen on Alison Nix
Hair styles: ponytails (either hair pulled back or separated in the middle or from one side) worn sleek and high or low, hair worn loose or tied up with a large headband (covering a bit of the ear), hear worn loose and separated in the middle. Either way, hair is sleek and shiny (no beadhead). Hair is decorated with lots of chunky accessories, think MJ.
sleek ponytail at
balenciaga ss07
ponytail separated in the middle
proenza schouler ss07
sleek ponytail worn low, separated from the side
miu miu ss07
headband covering part of ear at
hermes ss07
hair worn loose and separated in the middle
chloe ss07
overload of hair ornaments at
mj ss07
all pics from style.com