According to MSNBC, U.N. Secretary General Kofi Annan says that he has received a letter from Iraq's Foreign Minister which says that Iraq accepts the unconditional return of weapons inspectors.

I doubt that there truly are no conditions on the return of weapons inspectors to Iraq. In any case, many questions remain unanswered, including these:

1) Will troops accompany the inspectors in case Iraq denies entry to the sites that the inspectors wish to visit?
2) The composition of the inspector groups is different than in the early 90s. Back then, the inspectors were composed of delegates from the US and coalition forces. Now, they are expected to be UN employees, subject to its silly politics and policies. Back then, the inspectors had access to confidential intelligence information to tip them off to activity around the sites in question. Now, the allies probably will not share sensitive information for fear that it will educate the Iraqis about the methods used to gather the data. Given these and other issues with the quality of the inspectors and the inspections, will the results be satisfactory to the US and its allies? I doubt they will, and rightly so.
3) What about the other resolutions that Iraq continues to violate?

Saddam is proving adept at negotiation through the media. I doubt that he can deflect the President from his course to see that Iraq disarms, stops supporting terror, and adheres to the UN resolutions in force. The pressure on Iraq to prove itself through deeds, not words, will continue.