QuaZip is a Qt/C++ wrapper around Gilles Vollant's ZIP/UNZIP C package. It allows you to use Qt API to read and write ZIP archives.
The only change in version 0.2.2 from 0.2.1 is addition of LGPL as alternative license by popular demand. Please note, however, that QuaZip is based on Qt which is dual-licensed under GPL/commercial license. Therefore, if you use Open Source Qt, you must use GPL. If you want to benefit from using LGPL you must support Qt by buying commercial license from Trolltech. Fair enough.