I have noticed on a forum based not a million miles from SE23 an interesting extension of the usage of the word 'kudos'. I think it generally used to carry the sense of 'glory' or 'honour' - 'His exploits on the football field brought him much kudos'. But I see it can now be used to mean 'credit' or 'congratulations', as in 'kudos to you for your generous gesture.' Originally a US usage, according to my dictionary.