WeatherLive was recently updated to version 5.0 to add Windows Phone 8 support with includes wide live tiles with radar imagery. The good news is that with the update WeatherLive is now a free, ad-supported app. The bad news is if you want all the features of WeatherLive, you'll have to upgrade within the app. While the new live tile feature is nice, you may want to hold off on updating though.
The layout on WeatherLive remains basically the same (except for the banner ad) with pages detailing a ten day forecast, charting daily weather trends, viewing historical graphs, viewing an hourly forecast, viewing a charted temperature trend, animated radar, local webcams, and a moon phase page.