Stamps from Afghanistan were never embargoed, even during the Russian occupation. The Scott Standard postage stamp catalogue lists and pictures about 40 stamps issued between 1996 and 2002. There are no listings for stamps from 1989 through 1995. A Google search of "Afghanistan" and "postage stamps" turns up 17, 600 links, yet few of those discuss the period from 1989 through 2003. There's a UPU bulletin (#345) that states the stamps issued between 1989 and 2003 are "illegal". There's an interesting site on Geocities that's supposedly the Afghan Post's webpage. It features eight stamps issued by the "Transitional Islamic Government of Afghanistan". Are these genuine? Did they see postal service in Afghanistan? Is this the total output of the "Transitional" Afghan government? What's happening now that elections have been held, and a new government formed? What happened during the period 1989 and 2003, before these stamps were issued? How long will it take to find out?
There's not much more information on Iraq. Scott lists an importation prohibition for all Iraqi stamps after August 2, 1990, but lists stamps through February, 2003. A new issue, authorized by the Iraqi Provisional Authority was issued in January, 2004. What happened in between? What kinds of stamps will the new government produce when it finally takes power? A Wikipedia article reports "overprints appeared on various stamps, but none were officially authorized." There are many questions that still go unanswered, including an indication of how many stamps were issued, how many were destroyed, and how many used for other various purposes. Did the locals use some of the stamps of Saddam Hussein as targets of their anger? Did the Kurds use different stamps than the rest of Iraq for local use? Are there unrecognized "local" issues being used? Who knows! Maybe AskPhil will provide some updates soon...
One problem that will have to be dealt with is the listing of stamps as being "illegal", when they're issued by a former government, an occupying force, or by genuine revolutionary forces that control and operate postal services within territory under their permanent control. At the same time, stamps issued by non-governmental agencies, either for propaganda purposes or profit, need to be identified and treated with the appropriate disdain, both by collectors and dealers.
It will probably take a decade or more to get everything straightened out and the catalogues updated to reflect what's happened in these two countries. In the meantime, it's possible for someone to find a few real treasures - unauthorized overprints, locally-authorized overprints, and unusual usages of stamps from either or both of these countries.