Current Mods:Pistons
Buildcraft
Millenaire
Portal Gun

YOU SHOULD HAVE ALL OF THESE INSTALLED
ModLoader
SSP 
Audio Mod
SSP
ModloaderMP
SSP
TurboModel Thingy
SSP
More Achievements (Portal)
SSP

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Piston Mod
Download: SSP (Single Player)     Minecraft Forums
Video: 

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BuildCraft
Download: SSP (Single Player)     Minecraft Forums
Video:

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MILLÉNAIRE - NPC VILLAGE
Download: SSP  (Single Player)     Minecraft Forums   
Video:

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Portal Gun
Download: SSP (Single Player)     Minecraft Forums
Video:

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Elements Mod
Download: SMP    SSP            Minecraft Forums
Video: