Aaron's utility is useful to an extent, but it doesn't have ID3 Info support.
I hope he's OK, though.
EDIT
OK, I wasn't aware, but Aaron's MP3 Patch has limited id3 info support (three fields of id3 info), but you can't enter id3 info inside SONAR. You have to enter the id3 info before you apply the patch.
Heck, it's only like $9.99 now to get the activation for the Cakewalk MP3 Encoder. And ID3 info encoding is comprehensive. I think it would be worth it, just to buy the activation. The free stuff is lacking in it's feature set and/or doesn't have the convenience to be used without leaving SONAR.