Warning!!! Use at your own risk! Modifying files on your flash can be dangerous if you don't know what you're doing!
For those of you looking to modify the files on your PS3's flash, this tool may come in handy. Jjolano has released Dev_Blind 1.0, which is a simple dev_flash mounting tool. The app mounts dev_flash to the location dev_blind and enables full read and write permissions to the PS3's flash.
This homebrew just does what the title says (plus unmounting, if you run it again).
Tested on PS3 3.55 (kmeaw, if you need me to be more specific). It should work on any firmware though.
This enables writing to the flash, which is vital to the operation of the console's operating system - use this at your own risk.
This homebrew was created using the PSL1GHT SDK.
edit: in comparison with FreeFlash: this is ONLY using two syscalls (one for mounting, one for unmounting) - simple, efficient, and works.