There are a lot of discussions going on around the world about data citation.
ANDS has a Data Citation guide http://ands.org.au/guides/data-citation-awareness.html
but there is a lot of work being done elsewhere as well.
Heather Piwowar is one of the researchers heavily involved in this space and she has collected together a list of resources on data citation. This may be of interest to people. http://researchremix.wordpress.com/2011/05/17/resources-on-data-citation-principles/