Looking for a simple weather app for your Windows Phone? Smart Weather might be worth considering.
Smart Weather is a Mango app that takes advantage of the fast resume and Live Tile features the Windows Phone update brings to the table. The app itself is a very basic weather app but it's laid out rather nicely.
The main page of the app lists your forecast cities along with the current conditions (icon), temperatures and wind speed/direction for each. Tap on an individual city and you pull up a four day forecast for that city.
From the main page, you can set which city is your main city that will appear on the live tile. The live tile will rotate between the Smart Weather logo to the current condition/temperature display. The downside is that you can only have one tile displayed.
Smart Weather's settings cover language support (English, Traditional Chinese, and Simple Chinese), temperature units, auto updates, smart tips, and smart forecasts. The smart tips are toast notifications that give you tips on how to handle the forecast (e.g. carry an umbrella to work, weather turning cold bring in plants, etc.). I couldn't find a description on what the smart forecast does.
All in all, Smart Weather is a decent weather app but if you want more weather information beyond temperature and a condition icon, you'll need to look elsewhere. The nice thing is that Smart Weather is a free app and you won't be out anything to give it a try. You can find Smart Weather over here at the Windows Phone Web Marketplace.
Oh... here's an oddity. On the three-dot menu, you can pull up information About the developer and app. You have a link that goes to Smart Weather's homepage which does show multiple live tile support. If this is an update in the works, it will definitely improve things.
Update: Smart Weather was updated this morning to include support for multiple live tiles. Just tap and hold on the forecast city and you will see the option to pin the location to your Start Screen.