Conversion
Not having gotten much response to the question, "3e or 3.5", I plan on going with what I had planned on doing originally: a mix of the two.
In general, if there is a question, use 3e, unless I've specifically stated otherwise.
Thus far, I have to say the following:
Exclusive skills still exist.
Bards and Rangers are pure 3.5; all other classes but the Druid are 3e; the Druid is a mix (see below).
Wild Empathy doesn't exist; Animal Affinity remains, in its original 3e form.
Survival will be used, and replaces the two skills that it was supposed to replace (I believe they were Intuit Direction and Wilderness Lore).
These are subject to change; they aren't set in stone. If you have questions about something concerning which edition is being used, feel free to ask.
-----
Darkwolf, you asked about converting Narok. If you want to, that's fine, but I'm going to make some modifications to the 3.5 druid.
As I said before, Wild Empathy doesn't exist. Animal Affinity is an exclusive class skill.
For animal companions, use the 3e rules, ignoring all the 3.5 information; with the exception of the table concerning animal companion advancement, use 3e.
If there are any questions, please feel free to post.
[Edit - Concerning the HD of animal companions. I had been led to believe that druids' animal companions could not have HD's higher than half the druid's level. I just reread the 3e PH, and found that this is not the case. As such, follow the normal rules for animal friendship - you can't have more than your HD x2 in HD of animal friends. Thus, your panther would have 5 HD.]