I wrote my own rank tracker, that does exactly what I need, without having to schedule it, wait for it or tolerate its bloat & footprint.
It may not be the first of its kind, but it works - steady, day in day out.
Rank Tracker Pro
All paid monthly plans have 10-day free trial. Free (as in forever free) baby plan available.
Still adding features, looking for useful feedback.
Daily Tracking Updates:
Charts showing progress across Google, Bing and Yahoo:
Traffic information (Monthly Search Volume Estimates & Adwords CPC)