UrbanSync in Porto
Have a look at Dr. Stephan Baumann's 3 weeks-long UrbanSync experiment in Porto: http://urbansync.wordpress.com and get your hands on the resulting (huge amount of) data! That's great data for everybody (scientists, artists, ..), free for any type of mashup you wish.
Some very similar exciting research will be done (by you maybe?!) during the SMC Summer School, to be held just before SMC. Check this out on http://smcnetwork.org/summerschool/porto2009