SeleQ from Ximplify (http://www.ximplify.com/selQ/selQ_main.htm) is potentially a great utility for the 7650. It is currently in beta even at this stage offers advanced file management, screenshot taking, playing and viewing of files from directory listing and more.

For greater control over your phone's internal resources
Features:[list]
Get full access to your files
Organise and manage files on your phone
Move, copy and paste them into folders of your choice
Search and delete files (regular housekeeping with minimal fuss)
Share files with friends by sending them a copy via email or MMS
Beam files to another infra red or blue tooth enabled device
Open image files directly from directory listing
Turn your phone into a music player, just choose play from the file menu.
Capture screenshots and view them later (very useful for support & documentation)
Activate and deactivate infra-red as and when required with minimal fuss.
Automate the keylock function to enable the keyboard to lock automatically on closure thereby bypassing the annoying “Lock Keypad? message.[/list:u]