as i mentioned somewhere in this topic someday the built in filepicker of AdvancedContent will be replaced by an external module. But unfortunately all the promising filepicker or filebrowser pojects are not ready to go yet.
Since sometimes i really can be an annoying impatient person

The result is a little tool for module developers or webdesingers: GBFilePicker
Module developers can integrate filebrowsing (or just a simple filedropdown), including some fileoperations like create dirs, delete dirs, upload files or delete files using the GBFilePicker API function CreateFilePickerInput(). For more details see the examples in the module help. There also is a tiny API documentation that is included in the download and can be found in the dir doc/api or using the link in the module help.
Use with caution when used in fontend modules.
Frontend usage is not recommended at the moment due to security.
Webdesigners can use the {content_module} tag in their page templates to provide filepicker inputs that acts like content blocks.
As mentioned above due to security there is no default frontend function at the moment.
But maybe this comes later.
The module is always restricted to the uploads dir.
You can access any folder in your uploads dir.
With params you can control if users may browse through subdirs, may upload files etc.
Since this is the first beta version you will miss some features like the module settings in backend or customizing the output. But this will be integrated as soon as possible.
(At least all these filepicker settings you might already know from AdvancedContent will be in version 1.1. Customisable templates may follow in later versions.)
Have fun with this and please report any kind of feedback.
Regards, NaN.