I just thought I'd add that WiiGamers.com, for example, sold for low-mid $xxx if I'm not mistaken, and now is a perfect time to start a Wii site since the Wii is launching next month. Since the PSP was released in May 2005, it is very late to start a PSP site- and hence the decreasing value of the domain. However, if Sony sticks with the PSP name (PSP2?) for the PSP's successor, then the domain could still be used just fine.
Hope this helps!