Sara Ford has an 8 part blog series where she delves into getting started with MVVM and Xamarin.Forms.
SkiaSharp is a cross-platform, open source drawing library that allows you to share your graphics code across platforms. This article provides a gentle introduction to SkiaSharp with Xamarin.Forms and some links to help get you started.
The Effects API is an awesome part of the Xamarin.Forms framework. In this post, Adam Dunn presents a nice little Effect to add a long click gesture to any Xamarin.Forms element. Beats writing a renderer each time :)
In his Xamarin Forms 101 series Devlin shows how to use the KeyboardOverlap plugin to stop those pesky software keyboards from obstructing your entry fields!
Those of you coming from other XAML platforms may have worked with the VisualStateManager before. Basically, it allows you to specify states for a control, the appearance of a control when it is in a certain state, and when a control changes states. Well, it's on it's way to Xamarin.Forms world! Adam Pedley over at XamarinHelp introduces us to it.
Gerald Versluis shares some code to display PDFs within your Xamarin Forms application.