18 Most Beneficial Internet Sites for Tax Professionals from the National Society of Tax Professionals   1. Research basis or prices securities: http://bigcharts.marketwatch.com/   2. Very good tax information: http://taxprof.typepad.com/ 3. IRS Revenue Procedures: http://www.legalbitstream.com/irs_materials.asp?pl=i3 4. Various data information: http://www.melissadata.com/lookups/index.htm 5. IRS Private Letter Rulings: http://www.wwwebtax.com/audits/private_letter_ruling.htm 6. Julian Blocks' tax advice: 8. Payroll Tax Rules by States: http://www.lawresearchservices.com/firms/practice/ct-tax-state-department.htm   9. A general reference site: http://www.refdesk.com/ 10. A reference site for the business person: http://www.ceoexpress.com/ 11. All Tax and Accounting information: http://www.taxsites.com/ 12. 990s: http://www.guidestar.org 13. Search database of information for all states: http://www.searchsystems.net/ 14. Tax information site: http://taxtopics.net/ 15. A general site for tax, legal and government information: http://www.washlaw.edu/ 16. 1065 K-1's of some public companies: http://www.k1support.com 17. Tax information sponsored by Intuit: http://www.taxalmanac.org 18. Search Engine: http://us.ixquick.com/eng/