Here are some critiques and alternative plans:
Center for American Progress: A Progressive Plan for Meaningful Deficit Reduction by 2015
http://www.americanprogress.org/issues/2010/12/first_step.html
The People’s Budget: Progressive Caucus People’s Budget FY12 Memorandum
http://cpc.grijalva.house.gov/index.cfm?sectionid=70§iontree=5,70
Jeffrey Sachs on The People’s Budget and Ryan’s
http://www.huffingtonpost.com/jeffrey-sachs/the-peoples-budget_b_846573.html
For fun, here’s John Cole’s critique of press coverage of Ryan’s plan [Caution, the language does get rude]:
http://www.balloon-juice.com/2011/04/09/id-add-a-couple-things/
