Essential features as a feed reader:
- Instant data import from Google Reader
- Auto-discovery of feeds by webpage URL
- Compact UI, or at least an optional compact UI
- Widescreen support and dimension-adaptive display
- Inline excerpt display of arbitrary length in list view
- CSS Optimization such that highlighting any text field such as entry title for copying is easy
- Categorization of entries (manually star and label, or automatically filter incoming entries)
- Actual unread count for each folder, label, and feed
- Actual unread status for entries regardless of age
- Favicons
- Publish and fetch time of each entry
- Alphabetical sorting of list items, and drag n' drop support
- Keyboard shortcuts in agreement with the GR canonical definitions
- Search capability for feed and articles within subscriptions
- Complete subscription management (ability to easily add, delete, batch delete, label, rename, and reorder feeds and labels)
- Unchanged list and focus position when switching between display modes
- Load and search speed (server)
- Navigation performance when quickly moving through items (client)
- Auto-update of changes in fetch entries with a notice; avoid showing minimally different duplicates
- Site-wide SSL encryption
- Full cloud service with cross-platform compatibility on desktop
- API and Instapaper button (or other types of Kindle support)
- Personal and per-feed statistics
Social features:
- Share/broadcast with comments to personal public profile; feed output
- Send to friends via email
- Share via twitter etc.
- Attempt to unify internal "like" and external voting forms such as Google +1, Facebook like and Digg
- Trending topics and classified recommendations generated from social data and user labels/tags
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