WVNS in Beckley, West Virginia seems to be doing sort of a liveblog with updated information, plus they're streaming and archiving the various press conferences.
The Beckley Register-Herald, thus far seems to have one major story that appears to have been put together in increments and it certainly has the "local" angle. One assumes their larger website will be updated, as information about the Montcoal mining disaster becomes available.
Also worth monitoring: WVVA (Beckley); WSAZ (Charleston); the Huntington Herald-Dispatch; Charleston's Daily Mail and Gazette
Massey Energy: Official Site; Wikipedia
U.S. Mine Safety & Health Administration
WV Division of Mining & Reclamation
If and when other local sources are identified, this post will be updated accordingly and suggestions for local blogs or other sources are more than welcome in the comments.