Indiana tax sites
Indiana Department of Revenue: http://www.in.gov/dor/index.htm
Indiana Department of Local Government Finance: http://www.in.gov/dlgf/index.htm
Indiana Board of Tax Review: http://www.in.gov/ibtr/
Indiana Appellate Decisions (Supreme Court, Court of Appeals, Tax Court): http://www.in.gov/judiciary/2730.htm
Indiana Register (drill down on monthly collections to find Department of Revenue letters of finding): http://www.in.gov/legislative/iac/irtoc.htm
Colorado tax sites
Colorado Department of Revenue: http://www.colorado.gov/revenue
Illinois tax sites
Illinois Department of Revenue: http://www.revenue.state.il.us/#t=tab1
Iowa tax sites
Iowa Department of Revenue: http://www.iowa.gov/tax/index.html
Minnesota tax sites
Minnesota Department of Revenue: http://taxes.state.mn.us/Pages/index.aspx
Minnesota Tax Court: http://www.taxcourt.state.mn.us/