hellow there,
im planning to add more ram to my computer
i have 667mhz pc5300 ddr2  2gb(1 X2) i want to add 2 512mb.
and i was wondering ram speed have to match with cpu fsb.
does it have to ??
i found info about my mobo and it says it supports 533 MHz, 800 MHz, 1066 MHz (processor dependent)  
there is no 667
and the one i want to buy is this
http://www.newegg.com/Product/Prod [...] 6820144199
 
also does the ram brands have to match??

No. I have 3 different brands on my asrock board; all the same size and speed.

my mobo has 4 dimms
i currently have 1gb pc2 5300 on dimm 1 and dimm 3
if i add 512mb pc2 5300 on dimm2 and dimm4, will that work as quad channel??

You'll be fine. Match the same size sticks on the dual channel slots. There's no quad channel. Dual channel mode works in pairs; you'll get a 5-7% performance boost over single channel mode.