The above url will send you to a website full of nice clear diagrams outlining the steps and molecules involved in lots of cell signalling pathways. Some representations are a little more interactive than others, including the one I have linked to. Aspects of processes outlined in this link are apoptosis (cell death), the degradation of cellular proteins via a pathway involving regulatory proteins called ubiquitin and respiration in the mitochondria. The picture itself provides an interactive opportunity to see the 3D structure of these molecules involved and where these processes take place. The way they have presented this cellular landscape is beautifully done and still maintains accuracy in terms of the processes and molecules involved. They are putting these really quite complex processes into a context that enables you to see more clearly what is going on and where it is happening in relation to other such processes. I really enjoyed having a good explore through these diagrams and pictures and it is nice to see these pathways being represented in a new and exciting way.