TaxSites
AuditNet
U.S. Tax Treaties (by IRS)
Dutchtax.netUp to date and comprehensive English site on Dutch taxes for international corporations. Provides also a free monthly newsletter.
Bookkeeping Course - A free bookkeeping course, from journal entry to annual statements.
Tax professionals answer your questions for free about tax legislation in Russia.
The freelancer's essential guide to business and tax.
A tax guide for indipendent contractor.