On the right side of the screen just above the new animals box is a tab that says "My Favorites (Show)" Just click that and it will expand to show your favorites.
It's pretty much a FB wall crossed with the visitor messages system here on BP.net.
I'm not sure about the email thing. You can always contact Aaron Florian (The guy who started the site) and as, He's a pretty cool guy.
One cool feature I forget to mention is iHerp can generate printable sheets for your reptiles, just click on the "My Animals" Tab. The last option is Printable worksheet.
The batch feeding option is also pretty nice if you have a larger collection.