I have also contacted Soundgate about an adapter for the E. I am currently using a SNHOND3 from Soundgate in my 2003 Accord (to provide an Aux Input), and it works well.
I have also contacted Blitzsafe regarding a CD Changer adapter for the E, and they believe their current adapter should work, IF the E's bus connector is the same as the 02 Accords - which I believe is unlikely.