Best Android Apps by Category

Social Networking

• Twidroid (Twitter client)
• Facebook
  

Podcasts

• DoggCatcher
• Easy control over when podcasts downloaded

Desktop Music Syncing Software

• Salling Media Sync
• Allows you to sync iTunes with your Android phone
  

Music Listening

• Built-in Music App

Language Learning

• Anki
• Flashcard app
  
• Does not sync with Anki Online

Productivity

• Remember the Milk (Todo list w/ online sync)
• Movies by Flixster
• FeedR News Reader

Utilities

• WiFi OnOff
• Barcode Scanner
• Astro (File Browser)