QuiteRSS is a quite fast and simple RSS reader:

QuiteRSS Portable 0.15.3 has been released. QuiteRSS is a standalone RSS reader for monitoring your favorite RSS feeds. It's packaged in PortableApps.com Format so it can easily integrate with the PortableApps.com Platform. And it's open source and completely free.
QuiteRSS is a quite fast and simple RSS reader:

Feed and news filters: new, unread, starred, deleted
User 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.
PortableApps.com Installer / PortableApps.com Format

QuiteRSS Portable is packaged in a PortableApps.com Installer so it will automatically detect an existing PortableApps.com installation when your drive is plugged in. It supports upgrades by installing right over an existing copy, preserving all settings. And it's in PortableApps.com Format, so it automatically works with the PortableApps.com Platform including the Menu and Backup Utility.

QuiteRSS is a quite fast and simple RSS reader: