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Full user review
"Biggest Upgrade in years"
-Faster zip/unzip (many more recent benchmarks now make us the fastest of all compression packages)
-Unzips all kinds of compression formats, including RAR, TAR and 7z
-Practical Cloud connections (box, dropbox, skydrive, google Drive)
-Convenient file converters (PDF, photo resize, watermarks)
-Oversize file delivery over email
None come to mind.
Note that I'm biased since I work for WinZip, but I do invite download.com visitors to download version 17 and try it out, particularly for secure file sharing. There are some pretty dramatic changes under the hood and in the UI.