Hex Fiend Release Notes

Fixed a bug that caused exceptions when scrolling with a non-precise scrolling device (like a classic scroll wheel mouse).
Removed an .xcconfig file that was inadvertently being copied into Resources

Support for computing a binary diff between two files. This is a "true" LCS-based diff. Support for computing the diff lives in HexFiend.framework, while the document that presents it is in HexFiend.app.
Bookmark support. Bookmarks are little balloons that point at a range of bytes. They are not saved with the document.
Some support for attributes on ranges of bytes, which then can be translated into visual styles (such as colors).
Hex Fiend now has a privileged helper process ("Fortunate Son"), which can be used to read raw devices, root owned files, etc. Communication is via MIG.
Transient untitled document support. That is, if there is an untitled document that has never been edited, its window gets used by any document that's opened.
Undo can now be preserved across saves, when doing so doesn't require too much memory.
It looks more 3D. It's like you're really inside a hex editor!
Many more bug fixes representing a few years of work.