I'd like to explain few things magerette asked.
SRS (Srpska Radikalna Stranka) is Serbian Radical Party, an opposition political party in the parliament and very much right wing nationalists.
MUP (Ministarstvo Unutrasnjih Poslova), Ministry of Internal Affairs, is basically a fancy name for national police
LDP (Liberalna Demoktratska Partija), Liberal Democratic Party. As name says liberal democrats.
DS (Demoktratska Partija), Democratic Party. Along with SPS (Socijalisticka Partija Srbije, Socialist Party of Serbia) form current government in parliament.
Also a note for the mentioned Obraz movement in the B92 article.
Saying its "ultra right-wing", is very much an understatement. By European standards, they can be called clero-fascist organisation.
Wikipedia Obraz
Now for actual political situation. On one side we have Pro-European socialisticky responsible government formed of DS-G17 with SPS (G17 is another democratic party, but is united with DS now). On other are right winged nationalists, SRS with DSS-NS (DSS Demoktratska Stranka Srbije, Democratic Party of Serbia. NS - Nova Srbija, New Serbia, similar to DS-G17). And on the side are smaller party of LDP with minority parties (minority political parties are formed by minority national groups in Serbia).
SRS leader is Vojislav Seselj, who is currently been trailed in HAG Tribunal.
DS leader is Boris Tadic, current president of Serbia.
SPS was leading political party in '90 with Slobodan Milosevic as its leader. Right now they are reformed pro European (at least that's what they say
).
LDP's leader Cedomir Jovanovic was member of DS, but because of disagreement with Tadic he left and formed his own party.
DSS's leader Vojislav Kostunica is former prime minister. Right now prime minister is Mirko Cvetkovic, elected by new government.
Well that's all i can think of right now. If you have questions Ill try to answer them as best as i can