BitComet now also has sidebar advertisments which means you will have to look at ads whenever you open the client up.
Here are the rest of the release notes:
GUI Improved: add an option in BT task properties dialog to add this torrent file to my shared torrent list
GUI Improved: add "view task" command to the context menu of my shared torrent list
GUI Improved: add a filter in the toolbar of peer shared torrent list
GUI Improved: display peer shared torrent file number in peer shared node of fav list
GUI Improved: add an option to enable BT task search for HTTP/FTP download source in preferences dialog
GUI Improved: add commands to import/export task list and global settings under file menu
GUI Improved: add "rename task" function in context menu of task list
GUI Improved: detail error information will be displayed in tooltip when mouse cursor hover on the red-cross icon of a task which encounter error like disk full
GUI Improved: task rating information will be displayed in tooltip when mouse cursor hover on comment region of the task list
GUI Improved: add hotkey Ctrl+Home/End to move selected tasks to the top/bottom of task list
GUI Improved: support scroll information in all panes on which the mouse cursor is hovering by rolling mouse wheel
GUI Improved: add an options in preferences dialog to enable submit video file snapshot after task download finish
GUI Improved: add an options in preferences dialog to enable protection against ARP cheating attack from LAN
GUI Improved: new designed BitComet resource browser to accelerate open web page from BitComet
GUI Improved: improve displayed information layout in task summary pane
GUI Improved: add "minimize to system tray" to system menu of BitComet button in windows taskbar
GUI Improved: delete file check box in task delete dialog is displayed in red color
GUI Bugfix: View/download list/Columns menu does not work after switch UI language
GUI Bugfix: all tasks will be displayed as in queue if enabled auto-start task when download rate below specified value
GUI Bugfix: all tasks displayed in task list will be removed if launch clear recycle bin in recycle bin context menu even they are not in the recycle bin
Core Bugfix: fix a bug sometimes lead to memory leakage
Core Bugfix: handle some BT task with zero-size file incorrectly
Although I do not recommend BitComet, and especially not this newest version, you can get the latest version here: BitComet 0.87