Well you certinly can't stop Dark_Alex's firmware attack as he raises the bar through the roof! PSP Firmware 3.03 OE-B is Dark_Alex's newest achievement and the rumors are true!

Heres the readme included in the archive:

This is the update to 3.03 OE-B

Execute this only from 3.03 OE-A or 3.03 OE-A'

changes in OE:

- Patched the firmware to allow decrypted mp4-AVC videos to play at 480x272 resolution.
- pic0.png was not shown in psp isos. Fixed.
- The speed functions were not dummied after setting the speed. This could cause the few games
that set the cpu speed not to run at the selected speed in the recovery menu.

...Read more
- Changed the structure of the program to have more free ram in game mode.
sysmemp.prx removed, systemctrl.prx splitted into systemctrl.prx and vshctrl.prx.

Note: due to the inclusion of pic0.png, the iso cache has changed slightly; as a consequence you
will notice a slowdown the first time you access game menu after this update, just as if you have
modified the iso folder.

Changes in docmaker:

- A flag that lets increase the limit of 100 png's to 1000 was found. (this is the real maximum
number of images that support the emulator document.dat reader).
The document.dat's created with this version, can have any number of images between 1 and 1000,
and they will work in whatever 3.03 OE version.

Instructions:

- Just copy the files/directories inside MS_ROOT to the root of your psp.

About AVC 480x272
Note that what is patched refers to mp4 avc (which are the ones with best quality).
Standard mp4 cannot play at resolutions higher than the multiplication of 320x240 because the
firmware is not really prepared for that.

Well there you have it, PSP Firmware 3.03 OE-B for you're Sony Playstation Portable!

Oh ya I had better add the download link or else we might end up with some angry PSP users :D