While kludging together an RSS aggregator isn't all that difficult, I'm coming to the realization that implementing one I'd like to use every day is a challenging task. Yet for some of my research, I'd really like to modify the behavior of an RSS aggregator.
NetNewsWire already integrates AppleScript. So now I'm casting about for extensible aggregators under Windows. Awasu is the first one I've run across, although I need to dig into the other .Net based contenders, like SharpReader. Some of them, such as FeedReader and Syndirella are open source, so maybe I can hack in my own extensibility.