A few months ago, I posted about a very innovative way of using Twitter in science - monitoring fish catch by commercial fishermen.
The first phase of the study is now complete and the results are published in the journal Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 2009; 1: 143-154: Description and Initial Evaluation of a Text Message Based Reporting Method for Marine Recreational Anglers (PDF) by M. Scott Baker Jr. and Ian Oeschger. It is relatively short and easy to read, so I recommend you take a look.
The next phase will continue with the program, with refinements, and will also include records of fish catch from fishing tournaments. Also, I hope to see this study presented at ScienceOnline'10 next January as an example of the forward-looking use of modern online technologies for collection of scientific data by citizen scientists.