[gomijacogeo]

There was one nifty thing that fell out from having delay slots - you could write a threading library without having to burn a register on the ABI. When you changed context to a different thread, you'd load in all the registers for the new thread except for one which held the jump address to the new thread's IP. Then, in that jump's delay slot, you load in the thread's value for that register and, presto, zero overhead threading!