I've done this a million times before so I know how to install IC into a SMP server jar. Trying tonight with 8.10 and I'm not sure what's up this time.
1. Installed Flan's ML MP Server version.
2. Installed all of IC plus Nano Suit and Improved Pickaxe
3. No other mods.
4. Boot causes... 
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java.lang.VerifyError: (class: dl, method: a signature: (Lln;)V) Bad type in putfield/putstatic
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethod(Class.java:1935)
at ModLoader.Init(ModLoader.java:1242)
at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:72)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:255)
at bq.run(SourceFile:422)
2011-07-10 23:35:11 [SEVERE] Unexpected exception
java.lang.VerifyError: (class: dl, method: a signature: (Lln;)V) Bad type in putfield/putstatic
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethod(Class.java:1935)
at ModLoader.Init(ModLoader.java:1242)
at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:72)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:255)
at bq.run(SourceFile:422)
Installing only Flan's MP boots fine, but once IC is added in it crashes and burns.
Haven't tried many combinations yet, so I'll try disabling some other things. Thoughts? Thanks.