iPad Apps

[asterroc]

I was asked about iPad apps. If my iPad (and computer backup) were wiped today, these are the ones I'd be sure to get again. In the games category, I've only included the ones that seem to be standing the test of time. What apps do you feel are essential?

Workish:
- Neu.annotate (free) - PDF reader that lets you jot notes in the margins
- Wikipanion (free) - Wikipedia access in a prettier view, but can't edit and can only see one page at a time
- NASA (free) - lets you see the APOD, mission info, and lots more
- Exoplanet (free) - stats on each new exoplanet discovered
- Wolfram Alpha (paid)
- Show Me (free) - minimalist screen casting 
- Skype (free)
- PCalc Lite (free) - scientific calculator
- Dropbox (free) - lets you share documents across multiple computers

Social: 
- Twitter (free) or Tweetdeck (free) - Tweetdeck is better for multiple account support, but some installs are buggy

Games:
- Words with friends (free or paid) - scrabble, I'm Zandperl of course
- Enjoy Sudoku (paid) or :) sudoku (free) - (icon is the Thinker statue) - great interface for solving sudokus, and hints to help you improve

Other: 
- Accuweather (free)