First of all, GREAT TOOL! 8)
Probably best uploader around.
Here you are some suggestion to improve your app.
1 - Mask proxy password
Settings - Connection - HTTP proxy the password field should be masked.
(http://img36.imageshack.us/img36/3831/fuproxysettings.png) (http://img36.imageshack.us/my.php?image=fuproxysettings.png)
2 - No "Cancel" button
In Settings there's no way to undo anything. There's no "Cancel" button and clicking the red "X" in upper right corner give the same result than clicking "OK". ???
(http://img291.imageshack.us/img291/5346/fucancel.png) (http://img291.imageshack.us/my.php?image=fucancel.png)
3 - Select ALL/NONE
Please, add "Select all" and "Select none" in both Settings - Hostings view and Settings - Selection profiles.
4 - No updates behind a proxy
I'm behind a corporate firewall that needs HTTP Auth. The upload function works fine but the update function (Help - Update) doesn't work at all. The error log shows something like "AP:Read beyond end of file : EInOutError" while the update progress bar is stuck at 0%.
(http://img291.imageshack.us/img291/4175/fuautoupdate.png) (http://img291.imageshack.us/my.php?image=fuautoupdate.png)
Thanks for the attention. :)