It is not an issue which affects many, but those whom it does affect are pretty unhappy that Windows Phone 7 does not allow users to connect to hidden WIFI networks.
The functionality has not so far shown up in Windows Phone 7 Mango, making it appear to be one high profile bug which has not been addressed.
Now Brandon Watson has tweeted, in response to a question, that this functionality will in fact make it to Windows Phone 7 Mango RTM.
It does raise the intriguing possibility of other nice surprise features showing up in the final release software, but of course we can only dream.
Thanks Brianna for the tip.