Digital FM ("HD") listeners in Wichita, KS will be able to hear the BBC World Service 24/7 soon as KUMW adds HD2 and HD3 channels; the HD3 channel will carry the BBC World Service.
You can also add Vermont Public Radio to this list. The BBC World Service airs 24/7 on the HD3 channel of WVPS out of Burlington, VT.
Minnesota Public Radio's KSJN also offers the BBC World Service 24/7 on its HD3 service.
It looks like other stations are creating "News and Information" HD channels that retransmit the BBC World Service much of the time.
Keep me posted if you see other mentions of the BBC World Service and HD radio -- this may get the BBC closer to its goal of 24/7 access in major world cities.