Legal Developments post Citizens United

Citizens United V FEC (January 21, 2010 Supreme Court Ruling)
Speech Now V FEC (March 26, 2010 DC appeals court ruling)
Carey v FEC Hybrid PACs (August 19, 2011 DC District Court ruling)
Van Hollen V FEC (March 30, 2012 DC District Court ruling, ongoing)
American Tradition Partnership v Bullock- The Montana Case, ongoing

Advisory Opinion, 6/30/2011 - Majority PAC and House Majority PAC - Found that federal officeholders and candidates could solicit contributions on behalf of super PACs and other committees that can accept unlimited individual, corporate, and labor organizations as long as the candidate or officeholder abides by contribution limits during their solicitations. Also ruled that candidates and officeholders could attend, speak at, and be featured guests at fundraisers for these committees.

Advisory Opinion, 12/1/2011 - Constitutional Conservatives Fund PAC - In response to a request by Senator Mike Lee (R-Utah), found that leadership PACs are still subject to donation limits and reporting requirements and can not accept unlimited contributions from individuals, corporations, or labor organizations for the purpose of financing independent expenditures.

Campaign finance legal developments post Citizens United - OpenCongress Wiki