Comment 57 for bug 527458

Part of the problem here (to devs: correct me if I'm wrong) is that this bug is not about turning the tooltip switch back on but rather add code into indicator-application to recreate the tooltip function that was present in RIP system tray icons.

That requires more effort/time, but is well worth it (as the comments above pretty much raise a unanimous "get the tooltips back" opinion). It should be done ASAP so it can make it for Lucid final.