A few helpful and interesting sites:

acm.uiuc.edu/signet/JHSI/dance.html - a ballet dictionary

radix.net/~jmangin/clogging - the dance originated from the Appalachians, and stemmed from Irish and Scottish folk dance

metalab.unc.edu/schools/rls/index.html - Country Western dance library (steps, music, terms, etiquette)

rscds.org - the Royal Scottish Country Dance Society of Edinburgh (find classes and/or order instructional videos)

nyplgate.nypl.org - search the New York public library database for dance info or anything else (log in as "nypl")

ADTA.org - American Dance Therapy Association

artswire.org/Artswire/www/dance/dance.html - a much longer list of dance links! (I found a few there)

"There is no scarcity of opportunity to make a living at what you love. There is only a scarcity of resolve to make it happen."

Wayne Dyer