Ninnau (incorporating Y Drych), the North American Welsh newspaper is an excellent source of information and contacts.
Great Plains Welsh Heritage Project web site
The Welsh North American Association (WNAA) at http://wngga.org .
Cymdeithas Madog’s Welsh-language course, Cwrs Cymraeg, is a great place to learn Welsh!
Study Welsh language, music and more at Welsh Heritage Week
To hear Welsh words and phrases pronounced, go to http://www.ivona.com/en/?tk=37XnyXGfrZ , a text to voice site. This site is ideal to check on pronunciation of Welsh hymn lyrics, for example.
Cambrian Heritage Society of Madison at http://madisoncambrian.org
Events celebrating Cornish culture and language at http://www.cornishfest.org
History and other information about the Rhondda Valleys
Presentations about music and music history Dr. Dulais Rhys. (Dr. Rhys, who now lives in the San Francisco area has done presentations in Wisconsin about composer Joseph Parry .)