iText is a library that contains classes to generate and manipulate documents in the Portable Document Format (PDF). Document manipulation includes splitting, merging, and filling out forms (AcroForms, static and dynamic XFA forms).
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Apart from support for JPEG2000 (both jp2 and j2k) and support for base64-encoded images in XFA forms, this release doesn't bring any new functionality. However, it fixes some bugs that were introduced in 2.0.5. The most important issue that was solved is the broken RTF functionality. Problems with PdfNameTree, PdfReader/PdfStamper, WMF images, and others were fixed.