So, this post assumes you have a 1.1.2 jailbroken iPhone with iBrickr 0.91 running on a Windows PC. (iBrickr does work with 1.1.2 btw)
Im not sure if this has already been posted or not. I was playing with iBrickr tonight and made a couple of attempts to upload an m4r file into different folders to see if they would show up in my phone.
Finally I got it to work...
First click on Files...

Then click on Library...

Then Ringtones...

Then click on UPLOAD FILES and select an m4r file. Here is one after I uploaded "The Package"...
Here is a shot of the custom ringtones I added using iTunes, notice how they show up in a section labeled "Custom"....

And a shot of the new ringtone added using iBrickr...
