MtGox US LLC may have dropped the ball with their Dwolla account linked to their US company acting as a US to BTC gateway and not being registered with FinCEN.
Yes, it's looking like that is the extent of it, which is a relief. Failure to register their US subsidiary as a Money Service Business is completely negligent, but at least this doesn't seem to involve an actual money laundering charge.
The subsidiary, Mutum Sigillum LLC, doesn't appear to be registered on the FinCen site: http://www.fincen.gov/financial_institutions/msb/msbstateselector.html
Mutum Sigilum looks like it was set up for a completely different business, and was just conveniently co-opted when the online exchange business took off. Gox grew fairly organically from nothing, after all.