Bleh. I'm eying the PSP Go for the same reasons disolitude is, except I don't even have a PSP or a Zune, so I want it more. 16GB doesn't sound like enough for me (preferably would want twice that), if only it supported Micro SD...
Proprietary formats definitely do suck. This includes this Sony crap, 360 HD's, or even the memory cards of older gen systems. Imagine Nintendo used their own memory for the DS / Wii instead of the standard SD cards - that's pretty much how I feel about this.
I'll still pick it up eventually (after a price drop or some revision), but with just a few changes they could have definitely got me to pay the full $250 for the PSP Go, which is what kind of disappoints me.







