I've ported gkrellm but on OS2007 it blanks out the screen.
While playing a bit with some settings I'm able to see gkrellm.
And.. due to gkrellm, it's constantly showing 100% cpu

Maybe somebody can give it a try on os2008.
I'll upload it in a minute.

At least that post is to say that don't bother, it's not a direct port; needs some work.