It may look like a PSP, but it isn't as crappy. The NAV420 is a Sirius-ready portable navigation system. It has a 20GB internal hard drive capable of storing all of your map info along with normal media that can be played back. Not much else is know, but it will be on display in January at CES and you can guarantee that we will have all of the info about this little diddy.
And if you were keeping track of the XM and Sirius Thunderdome, Bushnell is releasing a GPS nav system that does XM, also.