We need to be able to export plans to other standard formats (xml, csv) otherwise were committed to working on one application which may or may not continue to be updated.
Afaik there is no "standard" xml format, do you have any specific format in mind? (Plan uses xml if you just unzip the file.) Since project data is structured, csv is a bit tricky. What are your requirements? Next release (3.2) has drag/drop, copy/paste in html format so you can get data into e.g. a spreadsheet.