I think I prefer that only the native formats (SVG, SVGZ, maybe Plain SVG) are in Save/Save As/Save a copy, and the rest is in Export. The reason is that with this setup, we avoid the extremely awkward situation with e.g. an EPS file being "loaded" into Inkscape as well as the "You're about to lose data" warning when you're closing such as file.
I agree with Bulia, and I'd like to add the folowing (if I may): - Any format that can be reopened and then fully modified in the software that generated it has to be listed under "Save". (these are native formats. For the meanwhile, Inkscape has only SVG, SVGZ, and plain SVG) - Formats that cannot be reopened or imported, (like EPS, PS, PDF, ODG) or that can be imported but with limited possibility of modification (like PNG and other bitmaps) have to be listed under "Export". Also, these formats have to be in the "Import" function, not in Open, for the same reasons. They are not native, but supported.
Another positive aspect of this division to native and not native formats, is that when the user works on a project, he can at any moment export to a supported format (EPS, PNG or whatever...) but Inkscape will not change the title of the opened file. The opened file will stay SVG (or SVGZ, Plain SVG...). If after exporting the artwork the user decides to close his modified file, Inkscape will ask him if he wants to save it in the NATIVE format. No
This is actually the behave of all the professional graphic programs I know (among them Indesign, CorelDraw, etc...)
This is IMHO the best way to make the difference between native and not native formats. In the future, if Inkscape will enlarge its possibilities to work with (for example) PDF and will natively open and save files in this format, PDF should then be listed under "save" and "open" funtions.
Thanks! :)
Molumen