In case you missed it, Gen. Jack Keane and Fred Kagan wrote the following in Wednesday’s Washington Post:

Reports on the Bush administration's efforts to craft a new strategy in Iraq often use the term "surge" but rarely define it. Estimates of the number of troops to be added in Baghdad range from fewer than 10,000 to more than 30,000. Some "surges" would last a few months, others a few years.

We need to cut through the confusion. Bringing security to Baghdad -- the essential precondition for political compromise, national reconciliation and economic development -- is possible only with a surge of at least 30,000 combat troops lasting 18 months or so. Any other option is likely to fail.

They continued:

It is tempting to imagine that greater use of Iraqi forces could reduce the number of U.S. troops needed for this operation. The temptation must be resisted. We should of course work with the Iraqi government to get as many trained and reliable Iraqi troops as possible into Baghdad, and we should pair our soldiers and Marines with Iraqis as much as we can. But reducing the violence in the Sunni and mixed neighborhoods in Baghdad is the most critical military task the U.S. armed forces face anywhere in the world. We cannot allow that mission to fail simply because some Iraqi units don't show up, aren't at full strength or are less reliable than we had hoped.

The United States faces a dire situation in Iraq because of a history of half-measures. We have always sent "just enough" force to succeed if everything went according to plan. So far nothing has, and there's no reason to believe that it will. Sound military planning doesn't work this way. The only "surge" option that makes sense is both long and large.

Details of the Keane-Kagan “surge and stay” plan may found here.