With the newer releases of ManaGunZ, disc dumping for the PS3 has become much easier. The 3Dump.bin file can be directly generated inside the PS3, only needing to be copied to your external USB drive (The option is found in System Settings, and the 3Dump.bin file will be generated in the tmp folder of hdd0; using ManaGunZ filemanager it should be easy to copy it to your usb of choice). Technically, it should also be possible to skip using the GetKeys package and get the decryption keys from ManaGunZ. Right now ManaGunz is able to generate what it calls a bluray disc key, which if I understand correctly can be also used for decrypting a PS3 bluray, though I have no idea how it relates to Redump's decyption keys.
ManaGunZ also supports dumping encrypted PS3 discs like MultiMan, and it doesn't require one to enable direct disc access every time a dump is attempted. ManaGunZ is also better at detecting when a BluRay is inside the console, whereas MultiMan (on some systems) require one to insert the disc only after launching the program.
Better yet, with ManaGunZ you can dump the encrypted ISO straight to NTFS without requiring to first generate it inside the console. This should avoid needing to split the ISO after generating it (btw, PrepISO isn't needed for ManaGunZ to detect the NTFS device, it is built into the program).
Using ManaGunZ should make it much easier for new dumpers to acquire the information they need to submit to Redump. We should consider updating the wiki to recommend using this new method, though I would prefer more people to try it out before submitting any changes. Your thoughts?
P.S. I think I should mention a few bugs I encountered using ManaGunZ:
a) The PS3 (sometimes?) freezes when a PS3ISO folder doesn't exist in your NTFS device and you try to dump an ISO.
b) Dumping the so-called bluray disc keys to NTFS appears to not work at all: it freezes when no PS3ISO folder exists, and it fails other times.
I have reported these bugs to the developer, and I'm still waiting to hear back from him; I'm hoping they are fixed soon.
Edit: Forgot to mention, ManaGunZ is also able to generate IRD files from bluray discs. They are generated automatically when dumping a decrypted ISO, and for now they can't be generated manually. Perhaps, if Redump begins to accept IRD files, the developer might add an option to do it manually, b/c as of now it isn't really a necessary feature.
Edit 2: The bugs I mentioned have been fixed in pre-release version 1.41. They should be included in the next official release of ManaGunZ.