Ok. I'll try to write something about Cracow's derby.
1.
Wisła Kraków
Name : Wisła Kraków, "Biała gwiazda" ("the White Star")
Full name : Towarzystwo Sportowe Wisła Kraków
Colours : (blue & white) & red
Founded : 1906
City : Cracow
Country : Poland
Stadium : Wisła Stadium
Capacity : nowadays about 10 000

. It used to be officially 15 000. Now it's being rebuilt (
http://www.stadionwisly.abc.pl) and will have 26 000 or 30 000 capacity
Address : ul. Reymonta 22, 30-059 Kraków
Record capacity : 35 000 (at officially 15 000 stadium!)
Year opened : 8th April 1922
Official Club website :
http://www.wisla.krakow.pl
League titles :1927, 1928, 1949, 1950, 1977/78, 1998/99, 2000/01, 2002/03, 2003/04
Cup titles :1926, 1966/67, 2001/02, 2002/03
European titles : hehe, the biggest succes was in 1978/1979 - Europe Cup quaterfinal
Other titles : League Cup 2000/2001, Polish SuperCup 2001
Cracovia
Name : Cracovia Kraków, "Pasy" ("the Stripes")
Full name : Klub Sportowy Cracovia
Colours : white & red
stripes
Founded : 1906
City : Cracow
Country : Poland
Stadium : Cracovia Stadium
Capacity : nowadays about 10 000, it used to have 12 000. Stadium will be rebuilt
Address : ul. Kałuży 1, 30-111 Kraków
Record capacity : I don't know exactly, in 1996 derby there were 13 000, but record capacity could be bigger
Year opened : 31st March 1912
Official Club website :
http://www.cracovia.pl
League titles : 1921, 1930, 1932, 1937, 1948
Cup titles : -
European titles : -
Other titles : -
2. the supporters and the match.
As you can see, both clubs were founded in the same year; they were founded also in almost the same place - meadow of Błonia (there's a big meadow in a centre of our city!) where they played till the stadiums were built. Their colours aren't totally incidental - Wisła's red shirts with white star and Cracovia's white-red stripes were to symbolise Polish national colours when Poland didn't exist as a independent country (Cracow was in Austria). Wisła admitted only Polish members, Cracovia admitted also Austrians and Jews (that's why Wisła fans sometimes call Cracovia "Jews"; it isn't antisemitic). Between 1st and 2nd World Wars both clubs were Polish powers; Cracovia was generally a little better. After 2nd World War communists make sport clubs elements of industry and government. Wisła was forced to become a police club (as you can imagine, in communist society police weren't liked too much) and Cracovia fans called Wisła "dogs" (police are often called "dogs").
There is no serious social, political or national difference nowadays between both sides fans.
The match. The derby between two sides is called "Holy War" since 1920s. Match between 2 oldest Polish teams were always hot and exciting, even if sport level wasn't best. Formerly fans of one team were meeting near their own stadium and marched about 1 km through the Błonia to the hostile stadium. Now due to security reasons they are taken by buses. Like probably everywhere in the world there are riots during the match. In Cracow, however, riots beteween two sides happen not only during derby matches - fans of one team are often attacked by their enemies when they're travelling back from a "normal" match. It is so often that unfortunately you can't see people in their teams' shirts and scarves on the street. Due to security reasons and rebuilding of stadiums this seasons' derby capacity was tragical - 10 000 in October 2004 and 6 500 in May 2005. When the new stadiums are ready, it'll be better, I hope.
sorry for my English and poor style
another derby mathces in Poland are: Łódzki KS - Widzew Łódź and Lechia Gdańsk - Arka Gdynia (two neighbouring cities). Legia Warsaw - Polonia Warsaw theorically is also a derby match, but due to small number of Polonia fans - it isn't treated seriously