Hi Adam,
I have been having problems with the latest CuteEditor (2006-02-09 - downloaded today) in DNN. Although DNN has the SharpZipLib.dll in the bin folder, I had to copy the ICSharpcode.SharpZipLib.dll from the CuteEditor bin folder to the DNN bin folder before any of the image, emoticon or similar dialogs would work in CE.
I am using DNN 3.2 but bearing in mind this thread I am hoping that having the two versions of SharpZipLib in the main bin folder will not result in parts of DNN not working properly.
You should note that your own DNN 3.0 demo throws the missing ICSharpcode.SharpZipLib errors, so it looks like your latest build actually doesn't work with the standard SharpZipLib library any more.
Geoff