I was showing someone stack overflow a few hours ago from a mobile phone. Connecting was fine, browsing/asking/answering questions was also seamless.
I did however have an issue searching the user list. When using a 'normal' browser the user search page refreshes as one types in the "Type to find user" textbox. Unfortunately the browser on my nokia did not do this auto refresh.
I realize that most user searches would not be performed on a mobile phone, but would it be reasonable to expect a button to the user search screen to 'submit' a search?