The track gain as automatically calculated and stored in the LAME tag is using 83dB as the target volume. this is bad! mp3gain uses 89dB, I use 89dB, even the replaygain site is going to move to 89dB, as discussed in previous threads.
This isn't a big deal - YET, because no software reads this field. But this should be fixed pronto IMO before it causes confusion and thus a lack of adoption.