I'm presently using pidgin, but it doesn't adequately notify me when I receive a message. I know I can get it to make noise, and pop up a notification, but I very specifically would like the icon to flash or wiggle (or something) on the sidebar until I check it. Is there a way I can get pidgin to do this/and or is there a different program that does? It needs to support MSN.
(Edit: Can someone create the "messenger" tag please?)
Pidgin does have a icon that runs in the Notification Area but all but the default applets are disabled. They can be enabled one at at time or you can enable all.
To do this you will need to add applications to the whitelist.
To whitelist all applications enter the following into a terminal...
To enable only certain applications enter the following into a terminal
so for pidgin only it would be
once that is done you ca have the notification icon blink on new messages, just right click on the icon and then select blink on new message, the notification icon will then blink on a new message.
The following page is my source for the commands to whitelist applications in the Unity panel, it also includes a GUI way to edit this and other settings via dconf Editor but use this tool carefully you can really bork your setting with it.
The source page is... http://www.webupd8.org/2011/04/how-to-re-enable-notification-area.html
NOTE: The above directions will cause the icon to blink on a new IM but not an email; you didn't specify but as you didn't mention email I assumed that you meant IM's... as far as I know there is no way to get it to blink with an email, you can only get the momentary wiggle of the Icon in the launcher for a email...