Patch Me

From KieSoft:

PatchMe is the easy to use utility to quick exchange of files and documents. Traditionally if you have permanent exchange of documents with somebody you have to send entire file again and again. PatchMe with revolutionary Patch technology compares two versions of files and generates patch file with the changes you have made within your files. Combination of Patch technology and built-in standard compression often resulting in an 80% to 99% reduction in original file size.