I believe the minimum level to send mail is 30 (I may be wrong). I suggest it be lowered to 29 so kid characters can send mail to their other account(s).
This Auction House issue is probably known by the team but in case it's not I'll mention it here.
The search function doesn't work. If you click on an item (or type it in) to try and find all similar items, it doesn't work as in retail. I expect it'll be fixed by OB but I just wanted to point it out