Great news we have another emulator to add to the collection for the PSP. RacePSP, the PSP’s Neo Geo Pocket and Neo Geo Pocket Color emulator hs been developed by Flavor. Although some bugs are present it looks very promising.

The PSPUAE Team and FOL have released an update to PSPUAE. The PSP Amiga emulator. If your not sure what an Amiga is or Commodore, I guess you were an 80’s child Wiki has a good write up on the Amiga. Anyway here’s the changelog:
V0.70 – FOL update
* Added alot of [...]

Zx-81 has updated two of his PSP Emulators today PSPColem (ColecoVision emulator) and PSPAtari (800, 800XL, 130XE and 5200 Atari model emulator)

PSPAtari v1.1.3 changelog:
What’s new in version 1.1.3 :
- fix issue with NTSC colors (thanks to carpy)
- bug fix with vsync option
- bug fix with pal/ntsc video system change

PSPColem v1.1.1 changelog:
* [...]

Zx-81 is at it again, releasing another great version of his Atari 800/130/5200 emulator for PSP. Lots of new features here:
-Speed improvements
-Auto-fire mode, press RTrigger+X to switch it on/off
-On given games, the auto fire can’t be stopped easily
(so you might have to disable it several times)
-Bug fix: settings weren’t properly loaded when using
-original 5200 menu
-Add [...]

Zx-81 has released an update to PSP2600, the Atari 2600 emulator for PSP. Changes include, use of the PSP GU for rendering routines, auto-fire mode and IR keyboard support.

Changelog
- Auto-fire mode, press RTrigger+X to switch it on/off
useful for games such as space invaders !
On given games, the auto fire can’t be stopped, so an
option to [...]

This released is based on the source code from Chui’s Dreamcast UAE4ALL and notaz’s UAE4ALL GP2x v0.7.2a. If your running this on a PSP Slim use the usermode Eboot in the usermode folder in the zip.

Source: TTYman

Or try:
PSPUAE – The First Amiga PSP Emulator

Sektor has released an update to REminiscence PSP, which is an emulation of Flashback the popular Amiga Game released back in 1992. This version supports 3.80 M33 Custom Firmware and has new analog stick suppor, plus a cutsence bug fix.
Changelog:
Release 0.1.9.3.80 (2008/01/17)
- compatible with 3.80 M33 firmware (should work on slim PSP)
- added analog nub [...]

Homebrew developer TTYman has released UAE4ALL r1, which is an Amiga emulator for the PSP. This released is based on the source code from Chui’s Dreamcast UAE4ALL and notaz’s UAE4ALL GP2x v0.7.2a. Being a kid that grew up with the Amiga in the house, I’m pleased to see another Amiga Emulator. I would have to [...]

Zx-81 has released an update to PSPSIM. PSPSIM is a Sam Coupe emulator for the PSP. SamCoupe is 1989 8-bit Z80 home computer released by Miles Gordon Technology. This newest release feature speed improvements and some other tweaks.
What’s new in version 1.1.1 :
- Speed improvement for all render mode
(all render modes use now [...]

Takka has released another version of his gba emulator, here’s the changelog:

HOME keys hung at the end of a correction
Menu at the “o” and “x” button operation of the PSP to match the setting
Cheat easing restrictions on the length of the name (UTF-40 character in securing 8N)
Fbm_print.c memory management malloc [...]

Developer Takka has updated the unofficial gpSP GBA emulator, making it test 8.6.
The original changelog is in Japanese so the following is made from an online translator:

UPDATE page from the “main update” to please.
Wireless LAN environment is not the way from here
Fonts created for the conversion tool, is included.
Comments pointed out that there was garbled [...]

Zx-81 has released an update to PSPCAP32 the Amstrad CPC emulator for the Playstation Portable which is a port of Ulrich Doewich’s Caprice32 emulator. This new update features many new additions and improvements. See the changelog below:
What’s new in version 1.5.1 :
- IRDA Joystick box support
- Add “IRDA joystick” device support for both
DB9 Joystick and [...]

Homebrew developer Uberjack has updated Caprice 32 to version 4.2.0.2. Caprice32 PSP is a Amstrad CPC emulator for the PlayStation Portable. Which is a PSP port of Ulrich Doewich’s original Amstrad CPC emulator Caprice32.
Changelog:
Version 4.2.0.2 [...]

Sony PlayStation Portable homebrew developer notaz has just released another bugfix for he’s PicoDrive Sega Genesis / Megadrive and Sega CD/Mega CD. Emulator. Here is the changelog:

mp3 code should no longer fail on 1.5 firmware.
added gamma adjustment option.
added .cso ISO format support. Useful for non-FMV games.
it is now possile to force a region after the [...]

Sony PlayStation Portable homebrew developer notaz has just released a bugfix for he’s PicoDrive Sega Genesis / Megadrive and Sega CD/Mega CD. Emulator. It seems the last release had quite a serious bug in when you tested the bios you were able to load any roms after that. Pretty big bug there, but quick to [...]

Another Sega CD and Mega Drive /  emulator has been released today for the Playstation Portable. This one is by Homebrew developer Notaz. He has quoted that most Genesis / Mega Drive games will run at full speed, Sega CD emulator is some what slow but can be improved with the frame skip feature.

This is [...]

PSP MAME4ALL v4.9r2 Hires Installer for PSP Slim:
Much like my installer for Quake, I have built an installer for the just released PSP MAME4ALL v4.9r2 Hires . This installer will easily install the files needed to get playing your favorite MAME arcade games. This is for the PSP Slim cfw 3.xx+ All that’s required your [...]

PSP MAME4ALL v4.9r2 Hires:
TTYman has updated PSP MAME4ALL to version 4.9r2. Good news is I can confirm that unlike the other release I got this working on my PSP Slim. And playing one of my old fav’s Snow Bros, that I used play back in the day down at the local shop before heading of [...]