I’ve uploaded my short presentation about Feckr and Blowtooth to Slideshare. It was presented as part of the workshop on playfulness and HCI at MobileHCI 2010 in Lisbon. Basically it is a short introduction to these recent projects and a proposal that mobile devices make the perfect co-conspirators for mischief and playful misconduct.
The associated paper has a lot more information. It has been added to the eprints repository at Lincoln, and can be downloaded free from here.