A new Custom Firmware has just come out. As Dark_Alex left the scene a few weeks ago, this new CF is coming from a russian team which like to call themselves M33 Team.
Summary of features offered by
CFW v3.51 M33- All functions of v3.51 firmware retained - PS1 support, high video resolution, MP3 visualizer, internet navigation, PS3 connection etc
- Launch official UMDS which require v3.51 firmware
- Direct launching of ISOs/CSOs
- Direct launching of homebrews and demonstrations
- Direct launching of PS1 images
- Ability to alter the CPU speed of the PSP
- Recovery mode
- Multi-region
- Bugfixes
- Customize all your icons etc

As you can see it´s pretty much the same as the OE firmwares but with the addition of the 3.51 functions. Also the installations seem to be pretty much similar.
Since it´s just been out a few hours ago and I am never too desperate to be the first one trying things out, I cannot confirm yet if piKey compatibility is still maintained.
If anybody feels like trying before I do, please share the results with us.
