Nope. I'm not aware of any certifications that are from credible
organisations, or that are themselves useful. (updates always welcome)
I'm certainly unaware of any benefits to be had by gaining any of such.
The only "web certifications" that have any sort of brand recognition
are CIW and Sun Java, Cisco etc. Now Java certification is great (good
example of how such schemes should operate) and it's worth having
career-wise, but it's not really relevant here. CIW is more likely to
have you branded as a newbie and dismissed as ignorant, more than
recognised as valuable.
The other question is whether you mean "usability" or "accessibilty".
The web's often bad at both, but any emerging legal constraints are
about _accessibility_, not usability. If we do ever see job
opportunities from this, it'll be for accessibility (giving everyone a
level playing field) rather than the arguably more important usability
(a site that's at least useful for someone).
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