DS Lite Launches June 23rd In EU
Gamespot reports that the DS Lite will be launching on June 23rd in Europe. From the article: "Nintendo has announced that the DS Lite will be available in Europe from June 23 at an estimated retail price of £99.99 , inclusive of VAT, in the UK, and 149.99 in Europe. The console will be available in both white and black, with the latter colour exclusive to the territory."
"Territory" is commonly used to denote the regions of release which games are typically separated into - the big ones being Japan, the US, and the UK/Europe (sometimes the last two go together, sometimes not). I've seen it used in both English and American publications quite a bit, it's pretty much standard usage.
Simple. I can fit a DS in my trouser pocket (barely, but I can, it's about the size of the original GBA). I can't fit a PSP in my trouser pocket (it's simply too long), especially if you consider that you need to add some screen cover or a bag or something to protect the otherwise unprotected screen.
So a closed DS is quite a bit more compact than a PSP with a screen protector added.