The CDC's basis for encouraging H1N1 vaccines for pregnant women is a report (available on their own website) of three pregnant women who presented with moderate flu symptoms, with one later dying.
So yeah, not much evidence, much less statistically valid evidence backing the hysteria.
Fact: There is no concesus in the medical community over the efficacy of the regular flu vaccine. In fact, most recent research supports the conclusion that the flu vaccine does not reduce mortality rates. Older research is littered with false causal claims, confusing correlation with causation, and inference based on non-statistically valid samples. Also, only healthy people will produce antibodies to the virus (what the vaccine is meant to do), and unhealthy people (with weakened immune systems) don't produce the antibodies. In order words, it doesn't work for people who need it.
Fact: Vaccines eventually render a population more susceptable to mutating viruses. The better approach, ecologically, is to let a virus run its course throughout a given population to build natural immunity. But of course, such a policy is untenable, since it would mean humans would have to accept evolutionary processes.
Here are some legitimate critiques:
http://www.nytimes.com/2008/09/02/health/02flu.html?partner=rssnyt&emc=rss
http://stanford.wellsphere.com/general-medicine-article/new-studies-confirm-the-flu-shot-still-doesn-t-work/543199
http://www.theatlantic.com/doc/print/200911/brownlee-h1n1