I have mine set to vibrate and flash the led. Granted it's red only but I still get a popup on top of those on an inbound IM.
Mostly everything else I want an alert for (meetings, tasks, etc.) are much the same.
Most applications that you need an alert for (because of some event) inject themselves into your profiles.
I don't mean to come across as "what more do you want?" but... um, what more do you want?
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