One banal example - I can walk into a liquor store here in Canada and buy Serbian wine whenever I want to.
Serbia's "Simpo" (furniture manufacturer) has just opened a showroom in Toronto. They have offices in 40 countries and as much as 40% of their furniture is manufactured for foreign markets. Serbia is the world's largest exporter of frozen berries. The main importer? The European Union. Serbia's foreign trade deficit has been slashed by 38% compared to the same period last year. Italy's Fiat is negotiating with Zastava for a joint venture (Fiat "Punto" might soon be rolling off Serbian assembly lines in Kraguyevats). Examples are too numerous to list; these are just off the top of my head.
I hope you're right about the Serbian economy improving, based on my visits and listening to my friends it has nowhere to go but up. But, I can assure you that their economy will only perform marginally at best until Kostunica and his allies finally stand up to the nationalists/socialists/communists/mafia who still control too many aspects of Serbs daily lives. This includes turning over multiple individuals wanted for war crimes, most notably Mladic and Karadic.
That might be true, but it does not stand for a normal working economy. In fact Serbia is doing extremely bad. The Serbian GDP is as low as $26.27 billion with a population of 10.8 million people (in comparison: Croatia has a GDP of $50.33 billion with a population of 4.5 million people). Even the Albanians are a much richer nation than Serbia in the meantime! As long as Mladic and Karadzic are not killed or imprisioned in the Hague, the EU will not give Seriba the privelege to join into the free trade area inside the EU. Furthermore Serbia has to meet the fact, that all European countries see the Hague as the only court that is qualified to give Serbia's war-criminals a suitable lawsuit. It is not a decision of the Serbian people or the Serbian gouvernment. My own country, Germany, had to stand the Nuernberg trials too. It was not comfortable, but a nessecary step to enter the community of civilized nations again. Serbia has also the chance of doing so. They will be welcome and they will get help if they work up their dark history.