Hello,
Are you looking for a desktop application or a web application ?
Please note that I can code a web application using PHP. It will have the following features :
1) Upload XML. View XML contents. Choose entries and add them to a list.
2) There will be a scheduler that will autotweet entries from the list ar regular intervals.
3) You can re-upload an XML to add new entries to a list.
Regards,
Vayne