I don't know if anyone is planning on doing something
like gkrellm. I imagine a direct port is unlikely, as I
gkrellm seems pretty closely tied to GTK and the Linux
process model, both of which are foreign to OSX.
That's right. I have GKrellM on My SPARCstation Voyager, and I had to compile gtk for GKrellM to work. Since the good folks over at macgimp have done this, it should work!