Got a ton of video in MPEG4 format laying around waiting to be put on your PSP, but you just can't cram it all on there? Never fear—the SavitMicro S25 HDD enclosure lets you use any 2.5" hard drive as a PSP storage device. Totally awesome. Just hook it up to your PSP, Digital Camera, or any other device that can accept an external storage device and you've got tons of extra space. The price isn't bad if you've already got the hard drive too. It's about $100 for the enclosure and USB cable and is shipping now.
The PSP compatible 2.5" OTG HDD case is here! [Akihabara]
Best prices on Sony PSP [Shopping.com]