I believe that a good vizualisation can help to have a better understanding of datas. One of the missing thing on the actual search.cpan.org is the lack of informations about a distribution's dependencies. So my first contribution to the CPANHQ project was to add such informations.
For each distributions, a graph is generated for the this distribution. For this, I use Graph::Easy and data available from the CPANHQ database. I alsa include a simple list of the dependencies after the graph.
Only the first level dependencies are displayed, as the distribution's metadata are analysed when the request is made. I could follow all the dependencies when the request is made, but for some distribution it could take a really long time, and it's not suitable for this kind of services.
edit: you can find CPANHQ on GitHub.