UPDATE: for 1.1.2's patch, check this thread.

This method patches the MeCCA and cheat iphone to play AAC ringtone. You gotta take 2 steps to make it work.

Step 1. Patch the MeCCA

Download the patched MeCCA from:

http://r_a_p_i_d_s_h_a_r_e.com/files/65697943/MeCCA.zip

(remove the underscores from the URL above)

Put it to /System/Library/Frameworks/MeCCA.framework/ folder (replace the old file). Reboot iphone to make it active.

Step 2. Create your ringtones

Use iTunes to convert sound file to AAC (.m4a), then rename the converted file to:

ringtone_name<space>.m4r

Notice: there must be a space before .m4r, so, a ringtone named MyRing.m4a should be renamed to MyRing .m4r.

Upload the renamed ringtone file to /Library/Ringtones, it appears in Settings->Sounds->Ringtones list immediately.

Update:
1. The customized ringtones will not conlifct with your paid ones cuz of the space (iTunes will remove any trailing spaces in the filenames)
2. Yes, it survives after sync

Credits to bgm370 of elite team.

im trying it as we speak...i hope it works

thanks for the good news!

Yeah this sounds pretty good. Have to test.

it works, thanks a lot

i wonder if we can use the same procedure for the text messaging sound

i just dunno in what folder are the text messaging sounds located in the iphone

nice, this is much easier than previous methods. worked great for me

/System/Library/Audio/UISounds

wooohoooo.......... easiest way ever... best bit its FREE!!! Thanks mate

yes!!! this works great and its easy!!!

Does it survive an iTunes sync?

cya,
Arne

thanks a lot! Works great!

Sticky ;-)