Thank you! I tend to remember ideas better than their names. (And linguistic relativity is a horrible name for that idea, IMHO.)
A quick glance around the internet suggests that Sapir and Whorf's versions of the theory - that language affects thought, but doesn't strictly determine it - enjoys moderate empirical support and continuing professional support. The stronger variants, broadly linguistic determinism, seem to be largely discredited.
Paywalled article (can someone with access throw a PDF up on dropbox or something?): http://pss.sagepub.com/content/early/2012/04/18/0956797611432178
Blog summary: http://bps-research-digest.blogspot.co.uk/2012/06/we-think-more-rationally-in-foreign.html