Online retailers by country
Circuit City Nice return policy. Good place to order a monitor if you need to get one online.
ewiz AKA SuperBiiz
Frozen CPU great for cooling supplies of all kinds and case mods.
Misco I need feedback on them... they look good.
Pixmania Just a gadget store but they have some good memory at good prices, and other stuff.
PC Look (France, has English version) Well organized, have some very high quality parts.
Techbuy good selection?
PC Case Gear
Conrad International These guys will ship anywhere. Selection is probably better than where you live, if you need them