I've made a CodeBank submission that wraps #ZipLib and makes it much friendlier to use, or at least I think so. There's a link in my signature if you're interested. Also note that .NET 2.0 does provide some compression support natively. I haven't investigated it fully so I'm not sure how extensive it is, but I have read that it has been designed to be extensible, so we should see some third-party extensions that provide support for more than just the initial BZip.