Projected Structural Budget Deficit for 2004: $391 Billionrevised November 18, 2003 (additional links, graphic). Graphic updated February 1, 2004.
In a technical report released last month, the Congressional Budget Office (CBO) now projects that the cyclically adjusted budget deficit will be $421 billion in 2004, about 3.7 percent of GDP. The cyclically adjusted budget excludes the impact of economic booms or recessions.
In another measure, the standardized-budget deficit is now projected to be $391 billion in 2004, about 3.4 percent of GDP. This not only corrects for the economic cycle but also excludes some other temporary or one-time items that affect the budget. The standardized-budget deficit can be termed the "structural" budget deficit.
The structural budget deficit is a calculation that is meant to help policymakers understand how much of the actual budget deficit ($374 billion in 2003, roughly $500 billion projected for 2004) is due to cyclical or temporary factors. Because the structural deficit is now so large, the argument that a return to robust economic growth will "solve" the deficit problem seems a stretch.
Using CBO's "rules of thumb" Centrists.Org has previously projected the impact of sustained, faster-than-expected economic growth, as shown below.

Links:
Congressional Budget Office The Cyclically Adjusted and Standarized Budgets: Updated Estimates (October 2003)
Centrists.Org Faster GDP Growth Won't Solve the Budget Problem (September 9, 2003)
For CBO's rules of thumb, see Congressional Budget Office The Economic and Budget Outlook: Fiscal Years 2004-2013 (January 2003) and that publication's Appendix C How Changes in Assumptions Can Affect Budget Projections
For CBO's current economic outlook and baseline (which Centrists.Org uses in it projections) see Congressional Budget Office The Economic and Budget Outlook: An Update (August 2003)
Centrists.Org No-BS Long-Term Budget Baseline homepage
Centrists.Org A Preliminary Assessment of CBO's New Budget Projections (revised August 29, 2003)
Centrists.Org No-BS Long-Term Budget Baseline Homepage
Centrists.Org Is the Recovery Finally For Real? (November 3, 2003)