I have been enjoying the SyncFusion suite of products for about 4 months now. Apart from a stellar set of UI tools, what I have liked about Syncfusion is the constant communication that they provide the developer community. One example of this is the Succintly series of e-books that they release periodically.
You can check out the list of books that they have at: http://www.syncfusion.com/resources/techportal
Just about the only thing I hate about the succintly series is that I need to enter my contact information each time I get download a book from the series. (especially since I have already logged into the site).
Oh! and while you are on their site, get their Metro Studio product for free. It’s the best free resource for metro style icons.
Disclaimer: I received a free copy of Syncfusion’s tools as a door prize at the Denver Visual Studio user group meeting and Syncfusion is also providing me a small cash compensation for this post. But, none of that influenced the comments in this post. I meant to post this as a resource long before I was contacted by Syncfusion.