...good call southernfried, didn't even think of MFR. I'm trying to set up a mob grinder using it but I can't quite understand the whole mob essence thing. Maybe help me out?
Sure, My current set-up has 2 tier 5 (zombie/skele) shards that drop onto conveyor belts, which carry the mobs into a 5x5 kill room with the grinder centered on one wall (I believe all of the mob blocks affect a 5x5 area). the grinder requires power(quite a bit actually, still trying to work this part out, because it can't keep up with the shards for long.) a chest (it doesn't seem to output directly to a pipe, but will spit it out on the ground) for mob drops and a liquid pipe for the mob essence(essentially liquid xp). pipe it into a tank and save it for later, It can be used with the auto spawner and auto enchanter. the auto-spawner is pretty sweet and can be used to spawn any mob captured in a safari net. (as a side note, the safari net is sweet as heck for moving mobs). I haven't used the auto enchanter yet, but it is on the to-do list. You can also use the grinder on friendly mobs, like cows and sheep.
Power Switch/Skele Spawner(with Conveyors!)
Grinder/output chest/liquiduct:
Serious Back up
Here are some shots of the cow farm, That I use to generate sewage(fertilizer for the farms, as well as a small amount of mob essence)
Breeder Pen:
The breeder(MFR Machine) takes wheat and auto breeds animals.
Baby pen:
I then use a chronotyper to move the babies to a separate pen.
Cow Grinder:
Then when they grow up another cronotyper moves them to the death conveyor.
If you have any questions just let me know.