go weather also doesnt update on 3g for me. it did update on wifi however on my Epic with froyo when i first downloaded it but was never able to get it to update again.
It's just the Today briefing Widget not the actual Clock/Weather widget. That one takes up the whole screen if not using an alternative launcher to resize it.
I installed the apk on my Droid X and set the permissions and then reboot my phone. I can see the widget in my list but it force closes when I select it. it must need another apk or something for into run properly.
You linked the wrong file, but I followed the above link which had the right one...but on my fascinate it fails to install. Says problem parsing the package. :/