: It seems like it is okay to do for now but is still a grey area. Here's a good article that goes into detail about this: Advertising Online Casinos - An Analysis of the Legal Rights and

It seems like it is okay to do for now but is still a grey area. Here's a good article that goes into detail about this:

Advertising Online Casinos - An Analysis of the Legal Rights and Risks

Excerpt:

While the legality of online gaming
itself is still an open question as a
result of conflicting court decisions
and stalled legislation, the legal
issues relating to advertising online
gambling services are even more
obscure. One of the reasons is that
the power of the government to
regulate advertising of a particular
product or service is not coextensive
with its ability to regulate or ban
the same product or service.

and

The concept of Internet gaming
advertising raises a host of legal
issues that are dependant on a number
of factors, including the medium
chosen for the promotion and the
potential applicability of various
state and/or federal laws. The courts
will employ the same legal analysis
used to evaluate traditional gambling
advertising regulations, but under a
relatively new paradigm that is based
on the underlying premise that the
government’s power to prohibit or
regulate particular conduct does not
necessarily include the power to
prohibit or regulate speech about that
conduct.57 The traditional
justifications for imposing
restrictions on gambling advertising
may well be lacking in the context of
online gambling promotion. Virtual
casinos do not generate increased
prostitution or drug activity, and
have not been historically infiltrated
by organized crime. The inability to
effectively geographically limit the
target audience for online gambling
advertising may also impair the
government’s ability to
constitutionally restrict advertising
about online gaming services to areas
where it is considered a legal
activity. Thus far, the United States
government has not specifically
legislated in the area of Internet
gambling, let alone the advertising of
such services. While the various
states have touched on this subject,
or have enacted legislation which
appears to regulate or prohibit such
promotions, the validity of any such
laws as applied to virtual casinos is
questionable.