Xceed Upload for Silverlight lets you quickly and easily add multi-file upload capabilities with no limits on the amount of data being transferred to any Silverlight 3 application.

All upload operations are asynchronous, meaning that the Web page hosting your application remains perfectly responsive and usable throughout the transfer

Includes Xceed Http Server Tools for ASP.NET, which gives you classes to make dealing with compressed/encoded files as easy as working with regular files. Also simplifies working with compressed/encoded strings. Supports Windows Vista, Windows XP SP2, Windows 2000, and Windows Server 2003 (except IA-64), and runs in Internet Explorer , Firefox 2 and 1.5, Google Chrome, and Safari (Mac OS 10.4.8+ only). Some OS/browser combinations are not supported by Silverlight.