i think wi-fi disconnect after sleep is quite reasonable......
if you own iPhone , you can get a push mail in every time and everywhere
this is the different
It is unclear what it does. You can set the iPod to pull Mail from the server every 15 minutes and it will do this whether it is asleep or awake. I know, since I just got mail from Apple while it was asleep and the bleep went off.
However, in the iPod Touch Manual Apple explicitly says that Yahoo Mail will be pushed to your iPod.
If you have a Yahoo! email account, email is instantly transferred to iPod touch as it arrives at the Yahoo! server.
What I want to know is if push email is active while the unit is asleep, or whether you need to activate polling to get your mail.
I think that push is active while it is asleep, because calendar events are pushed and available as soon as it wakes up. It just seems that mail is not working 100% right now.