Astro Apps

So, what are the hot, must have Astro Apps?

Here are my current micropayment and (guilt) free astro related Apps, what other spontaneous little thrills ought we be hoping for Santa to bring us?
Strictly professional applications, of course, well, that and pretty pics:

    Here is what I got right now:
  • arXview - I like Dave Bacon's implementation of an arXiv viewer
  • NASA
  • HubbleZoom
  • 3D Sun - gorgeous!
  • Planets
  • Space Images
  • Spitzer
  • Exoplanet
  • TimeTree (astrobio, really it is!)
  • Swift
  • CosmoCalc

I also consider FlightPro, Travelocity, GoogleEarth and WolframAlpha essentials for work.
And, Angry Birds, for the extra long faculty meetings...

Anyone else have any favourite must haves?

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More like this

Google Sky Map

Earth Geomagnetic Calculator 3D

Osmos - it gave me a deeper appreciation of planetesimal dynamics and why angular momentum rules over (almost) everything, also demonstrates linear dynamics quite nicely. Should be compulsory for undergraduate mechanics :)

Transients
Star Walk
GoSkyWatch

I'm looking for an app/calendar that will push notifications of interesting events: lunar eclipses, conjunctions, meteor showers, etc. Perhaps this is an iOpportunity?

@HD sounds like an iOpportunity, albeit a modest one.

AstroBetter also asked for AstroApps, with similar results;
I see Star Walk is popular, Starbucks is offering it as their Free App of the Week this week, go get your double skim peppermint mocha frapp venti now and get your Star Walk on!