Yesterday I tried overclocking Raspberry PI and the SD card was busted. lol. I properly rebooted the system and the file system was broken. It seems like overclocking and SD card doesn't go along well.
Also I installed "mini DLNA" and NFS, Network File System, for movie streaming. They works very well. I don't know exactly why but I am super exited about having my own NFS server; probably because I dreamed of having one at home since college. lol. It seems like people report that NFS works faster than Samba in terms of network performance.