e-Log is the life logging project using mobile devices (ViconRevue or called Sensecam and iPhone). It also monitors all my social communication records using software sensors. All data collected are managed by the e-log database system for experiential information retrieval.
The key challenge in life logging is the back-end database system that needs to maintain all sorts of logs. The e-log database challenges this problem using the concept of an event as a generalized life modeling basis. The knowledge and data we have on the event is represented as the directed connections between events where their rules on object formulation and connection are mathematically well-formulated with the software system support. See the E-model database, which I developed during my PhD in GaTech as the back-end system for this approach for details.
I am now developing and maintaining the elifelog.org community for open-source life-log research collaboration. See you there :)