A recently brought to your attention Greg Mankiw's blog. Today I'd like to bring to your attention a few more that are interesting to check out regularly.
A Harvard economist with seminal contributions in several areas especially development economics: 'Unconventional thoughts on economic development and globalization' is the heading in his blog. A must.
'Research-based policy analysis and commentary from Europe's leading economists'
(Professor of Economics at the University of California at Berkeley)
(the book is good; I haven't really followed this one but I think I'll be checking it out here and there)
Economics UK dot com
For my UK buffs: 'All the economics you need. Welcome to EconomicsUK, the personal website of David Smith, Economics Editor of The Sunday Times, London'
and, of course, Paul Krugman