QuiteRSS Portable 2on3i

QuiteRSS is a quite fast and simple RSS reader:

Feed and news filters: new, unread, starred, deleted
filters
Feed import wizard: Search feed URL if site URL was entered
Embedded browser (Webkit core)
Mark news starred
Automatic update feeds: on startup, by timer
Automatic cleanup on close using criterias
Enable/Disable images in news preview
Ability to quickly hide feed tree (for comfortable viewing)
Open feed or news in own tab
Quick news filter and quick search in browser
Optional sound and/or popup notification on new news
Show new or unread news counter on tray icon
Import/Export feeds (OPML-files)