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I like electronic day planners, and Pocket Informant is as good as they get. It adds good calendaring to sophisticated task management, all of which can be synced with Google and other cloud services.
The different display modes are fully customizable to build a system that reflects exactly how you like to work.
$12.99 on the Android Market
I spend far too much time on Twitter, and I like the simple display of Tweetcaster. It is easy to read and is full-featured as Twitter clients go. I particularly iike using Tweetcaster in portrait orientation which displays quite a few tweets at a time.
$4.99 on the Android Market (Free version available)
Feedly is a news magazine app that scrapes RSS feeds and social networks to present updates in an attractive magazine format. It is similar to Zite, available only on the iPad. The subject matter can be customized in Feedly to present only the topics of interest.
Free on the Android Market