LastFmLib.net lets you access all Web services provided by Last.fm. This also includes an implementation of the Audioscrobbler 1.2.1 submissions protocol and radio api. Also, LastFmLib.net provides a set of useful classes, e.g for caching requests and pictures and for accessing simple request easily via the LastFmClient class. The library should be fully Mono compatible (the test with MoMa was positive).
PDFXMLRPC enables client-server PDF creation from text over the Internet or an intranet, running over XML-RPC and HTTP. It consists of a library that you can use to create an XML-RPC PDF server, a library that you can use to create an XML-RPC PDF client, and clients created using these libraries. The client can send text to the server repeatedly, using XML-RPC method calls. The server converts that text to PDF content, and in response to a different method call from the client, sends that PDF content back to the client. The client then saves that PDF content to a local PDF file.