I haven't used MindCrack specifically, but there's a pretty good server mod you can install called Dynmap. You can get it
here. Assuming MindCrack uses 1.4.7 get the one labeled "Minecraft v1.4.7 with Forge v6.6.x:
DynmapForge v1.5" and put it in the /mods folder on your server only (clients don't need this). Then, to access this, you go to your server domain or ip address at port 8123 through a browser (ie
http://minecraftserver.com:8123 with your server domain swappedin.)
I think I tried all the other web interface plugins available and none of them had the level of support for the mod blocks present in any FTB world. It's not perfect, but the map quality is as good as it gets. You can view players locations against the map, select different dimensions, see their health and hunger, and both listen in on AND participate in in-game conversations from the web interface. It's very highly configureable, but the default options are pretty good on their own.
