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RSSOwl is a great newsreader, but it would be my favourite if:
it could show a cute little number next to the feed's name saying how many new articles there are.
and.. (maybe i got this one wrong) i could choose not to open every new feed in a new tab, but replace the existing open tab.
Now, i admit that maybe all these are already possible options and i didn't get to find them, in which case im sorry for the useless post.
Anyway, i love open source software, and cheers for the great app.
The first feature was requested by others already and will be added in future versions of RSSOwl.
For the second issue, how about not using Tabs at all? You can control this setting in the "View" preferences.