I tweeted this, but it is so fantastic it needed its own blog post.
Nathalie BELVAL (@nbelval) put together this handy card for designing and developing apps for Windows Phone 7.x and Windows Phone 8. It contains all the information you might need for:
- Resolutions in Windows Phone 7 & 8
- Application assets (screenshots, splash screens, application icons, etc)
- Accent colors
- Available icons
Download it, print it, love it.
Thanks to @winphonegeek for finding this.