I created a guide back in January to hack the PSP, because most guides were outdated and did not work. I improved the guide and removed and added some things. Here it
Complete Guide to PSP Custom Firmware | ReviveToday
Physical Security Professional (PSP)
Sony PSP 3000 review: Sony PSP 3000 - CNET
PSP Hacking 101 - Basic Info : r/PSP
PSP-4000 rumors, PSP2 software already being developed? - CNET
PSP Go review | Engadget
PSP News | Push Square
Generic PSP Handheld Game Machine X6, 8GB, 4.3 inch Screen, Built-in Over 10000 Free Games, Black - Walmart.com
PSP Accessories | Newegg
PS Plus guide: all PS1, PS2, and PSP games with trophy support
Joystiq Guide: PSone downloads hit the PSP (by way of the PS3) | Engadget
PSP Go Teardown - iFixit
Restored PlayStation Portable PSP 3000 Core Pack System Piano Black (Refurbished) - Walmart.com