I'm not sure if this is the right forum -- I couldn't find one specifically for "WMP 10 SDK" questions.
I've managed to create a renderer plugin using the Wizard from the WMP SDK. It shows up in WMP under Tools | Plugins | Options | Renderer. However, it doesn't seem to get invoked by WMP -- I've run with wmplayer as my executable, and set breakpoints on all the methods, but they never get hit. Also, the renderer plugin doesn't show up under regular Tools | Plugins -- I have to dig down into "Options" (unlike for DSP plugins)...is this normal

Creating renderer plugins
Jebat
The right place for this question is the newsgroups under
http://www.microsoft.com/windows/windowsmedia/community/newsgroups/WindowsMedia/default.mspx
Specifically the Windows Media SDKs group and the Windows Media Player group.
Your rendering plugin will be invoked only if you are playing ASF content that has a binary stream with a type that matches your plugin.
-Sumedh