It seems that it's been a while since SilverlightContrib has been updated, and I needed the SharpZipLib port to do compressed serialization in some of my Windows Phone projects, so I downloaded the source, upgraded the lib with VS2010, removed the System.Windows.Browser dependency (which silverlight for Windows Phone doesn't have), and recompiled.
The only things I had to remove from the lib was the MouseWheelHelper, and ClipboardHelper, so it wasn't a train smash.
Here's the lib for those who might need it (have yet to see if it actually works, but I don't see why not).
I've renamed the assembly, so it won't get confused with other versions.
6 hours ago