I found couple free aggregators. I compare them and in result now I use both RSS Bandit (http://www.rssbandit.org/) and IntraVnews (http://www.intravnews.com/; integrates with Outlook XP/2003). Here are the others, which I discarded:

1. RssReader 1.0.72.0 - lack of functionality (export/import, drag-drop subscribe, one level groups, etc.).
2. NewsGator for Outlook - not free.
3. NewsChoice! 1.0 - lack of functionality (export/import, drag-drop subscribe, third window with banners, etc.).
4. NewsWatcher 2.2 Build 540 - lack of functionality (drag-drop subscribe, no groups, problems with cyrillic symbols, etc.).
5. Feedreader Alpha 2.5 Build 610 - lack of functionality (export/import, drag-drop subscribe, one level groups, problems with cyrillic symbols, etc.).

I immediately will compare SharpReader with them :-)