Joint Blog of Bruce Bartlett, Steve Collender, Pete Davis, Andrew Samwick, and Troy K. Sneider: Capitalgainsandgames
Paul L. Caron: Tax Prof Blog
Paul Krugman's Blog on The New York Times.
Greg Mankiw's Blog
Donald Marron's Blog
Bill McBride (previously with Doris Dungey) blog: calculatedriskblog
Diane Rogers' Economistmom blog
Tax Analysts' Blog
Tax Policy Center's TaxVox
Multiple participant blog: AngryBear