You may be in luck msduncan!
Check this out, from the IGN PSP forum:
So I was down at my local EB today buying Robots for the DS (I'm desparate, please help me...), and I was asking about the PSP (I just finished paying off my pre-order last week). He said they were told to cut of pre-orders a couple of weeks ago (not just saying "2nd or 3rd shipment", but cutting them off completely). Then, he said they had a conference call a couple of days ago, and they were told to open them again. They still can't guarantee 1st shipment, but he said it was a good sign. Apparently, EB was able to secure more PSPs from Sony than they originally thought. And I'm sure GS, Best Buy, etc. are in the same boat. So, it looks like Sony is going to make the 1 million for launch.