What are the current security issues for the US relevant to the recent Libyan situation and NATO intervention?

Well, for the most part, things seem to have worked out for the best. However, since the NATO intervention was primarily through application of air strikes, many of Gadaffi's weapons caches were secured by revolutionary forces rather than NATO forces. It is believed that these caches are varying types of handheld weaponry. No tanks or WMDs, but plenty of machine guns, rocket launchers, and other very portable forms of destruction. The main security risk here is that the new government will sell these in order to bolster their income (Libya's main export is oil, but Gadaffi's regime prohibited significant oil exploitation, and it will take time for the new government to make that profitable again, meaning there's a need for an alternate source of funds). If such weapons are sold, the buyers will likely be small military groups without their own weapons manufacturers. Many of these groups are enemies or potential enemies of the US.

This threat is based on the assumption that the provisional government will be irresponsible with these weapons, which is possible.