Speedbird 48- let me put this straight... there is no 'sponsorship' as such- you still pay for your training as anyone else does in the USA. The 'sponsorship' is for the visa, because in order to get a working visa for the USA, you must have a proposer to petition the INS... i.e., a 'sponsor'.
Kenny- Interesting. I am aware that the H3 visa is a training visa, but from the presentation I understood them to be peddling full time jobs to their people on H3 visas. Looks like I'll be giving it a miss then!
BTW, the person who passed me the advert for the seminar was a guy who has worked in the diplomatic service most of his life... that is, the US diplomatic service. His wife still works at the US embassy in London. What is most interesting is what he had to say about my quest for a US working visa. His verdict? Marry an American!