Here's some stuff I have done in the past year, I work for a small company, but run a personal computing cluster of 167 servers that I pay for out of my own pocket. I really enjoy loading "big" datasets into them and working on improving algorithms or gaining insight into the data.

I (try and) network around London and offer my services for free to people who have interesting problems.

- Very high resolution FMRI data. A single scan can be 10-20GB

- Infringing URLs for a piracy company, 4 billion rows

- DNA sequences and Protein Data, lots of variation in sizes, from a few hundred MB's of string data, to hundreds of GBs

- RAW radio data for a military skunkworks project (10's of GB / min)

I would really like to find an investor who could take me off my full time job, I have 3 quite large projects I would like to build, one I have almost finished.