As of October 21, 2011 - Methylone was banned under an Emergency DEA order.

The DEA proposes to placement of Methylone Into Schedule I permanently:

SUMMARY: The Drug Enforcement Administration (DEA) proposes placing 3,4-methylenedioxy-N-methylcathinone (methylone) including its salts, isomers, and salts of isomers whenever the existence of such salts, isomers, and salts of isomers is possible, into Schedule I of the Controlled Substances Act (CSA). This proposed action is pursuant to the CSA which requires that such actions be made on the record after opportunity for a hearing through formal rulemaking.

The complete text of the proposal can be found in the Federal Register here

Methylone is a relatively recent synthetic concoction that produces symptoms similar to several drug classifications, including amphetamines, cathinones, and entactogens (pychoactive drugs with particular qualities).  Users state this drug is similar to MDMA (ecstasy)-but not precisely--with more of a depressant effect.   Methylone is marketed over the internet and in drug shops in 5 ml tubes as a "room odorizer" under the name "Explosion."  The tubes cost between $13 and $17 each--far in excess of other products designed to actually mask odors.