Jarofdoom

Same old vanilla client with vanilla forge and vanilla IndustrialCraft2

If you look on the wiki page I linked you, you'll find a ported IndustrialCraft2 mod.

CraftBukkit is not Vanilla server, and as such any mods designed for Vanilla Minecraft will not work out of the box. They need porting. These people do the ports, and you can download a ready-modded craftbukkit from here: http://mcportcentral.co.za/wiki/index.php?title=Ports_for_1.2.5

You are using ModLoaderMp. ModLoaderMp conflicts on the server side of Forge. Try reinstalling, but omitting the installation of ModLoaderMp on client and server side.

No, this forum is not for support of other mods. However, try installing otpifine last.

Tested with latest forge with and without IC2. You made a mistake somewhere, snowballs rendered for me.

Which version of Buildcraft are you running? BC3 is not SMP compatible at this moment in time. Additionally, in future give us your relevant ModLoader.txt and spoiler any console messages.

Did you delete META-INF? I don't think you did based on that error.

This is for an old, unsupported version of Forge. Test on the latest version, if its still there, post again.

Risugami's ModLoader is a dependency of Forge, as such, you can use both whilst developing.