The SEC has approved new, more stringent exchange listing requirements for companies that go public through reverse merger rather than traditional registration/IPO.
The SEC final rulemaking releases for each major national exchange are available here:
The SEC's press release is available here: http://www.sec.gov/news/press/2011/2011-235.htm
Based on my prior experience with this very issue, I view this response as over-broad. (Even the SEC acknowledged that the issues giving rise to the new rule arose in the context of foreign issuers.) This is yet another set of new regulations that, along with many others, could have the cumulative effect of stifling economic growth when our country badly needs it.