As I wanted to add a slideshow on the MyOwnDB homepage, I started looking for a ready made solution, but as I didn't find exactly what I wanted, but also because I was curious of how it could be done, I started coding one based on YUI.
File uploads are finally deployed! You can now specify in MyOwnDB that a detail of your entity is of the type "file". This will let you attach a file to an entry, and subsequently replace or delete it. This required some changes in the application, more specifically in the way the forms are submitted back to the server.
For a file upload to work fine, you have to send it with the enctype attribute set to "multipart/form-data". But that's not all! You cannot just serialize the form in javascript like you can do with other input types because you cannot access the file from Javascript.