So how about anti depressants (think SSRI à la Prozac)? They might not be Huxley's soma or quite as convincing as the pill described in the post, but still, they do simulate something that may be considered happiness. And I'm told it also works for people who aren't depressed. Or for that matter, a whole lot of other drugs such as MDMA.
I'd sure as hell buy it (well given it was not published by Springer and priced accordingly :P)!