Honestly by far and away the best reader app if you need sync with Google Reader is ... Google Reader, in the Safari browser. It works super-fast, syncs instantly of course, and is continually getting tweaked and improved by Google.
If you don't absolutely need Google Reader sync, the next best IMO is NetNewsWire - has a good desktop app for Mac and a good iPhone app, and loads of good features.
Others that are decent that sync with Google include Byline, Feeds, and Doppler.
I don't know of any that have a 'tweet this' type feature - though of course it's easy enough to copy a link now in OS 3.0 and paste it into a Twitter app - many of which have good URL shorteners built into them.
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