Ok, now save mine... :| I tried loading the RSSyl plugin (which appears to be installed on my system in app manager) but going through Configure / Plugin just shows me the gtkhtml2_viewer.so - the path on top of the window is /usr/lib/claws-mail/plugins. I browsed that folder and it appears that it really contains only that file (ls -a shows just that, other than "." and "..")
Oh, and just before I ask it as soon as I successfully installed the plugin... Is there any way to export my Google reader (or through readermini.com) feeds and import them into claws mail? Does it support OPML import as google reader does?