hey ho. Just putting in a request for psi-xmms2 for gdesklets. See URL above. I'll work up an ebuild for you. I've wasted about 45 minutes at work aligning these things now that I've become enamored with them. gkrellm2 is the devil!
OK actually it's called psi-small-xmms and I assume it's version 2.
The psi sensors are now deprecated. Until the author updates his desklet or it's proven to work with the latest version of gDesklets, I don't think we should consider this high on the priority list.
The Psi desklets are going to be removed soon as they are deprecated.