You could establish a speech-recognition@home type of application, in the style of SETI@Home et al. If you create an application that can do some useful, but well defined set of tasks using speech recognition, you could build up a very useful open (as in useable by all) and free (as in beer) data base of everything you just mentioned to aid a linguistic study.

Set the application to do something useful for the user that downloads and installs the application as an incentive and well-define the task such that it addresses a small enough to be finite and study-able set of language. As users use the application they get the system to learn the language (multiple users together would be useful too to be analogue to a child's multiple sources of learning) and as the system learns you build data, which is shared and accrued from all the distributed installations of the application.

How about a Firefox plug-in/extension to do this. Is Firefox a simple enough application to start this with? It could be both fun for most users and practical for those using accessibility functions with their computer.