I just read over at LifeHacker that Adobe Reader 8 has the ability to read rss feeds. Now maybe there's a perfectly plausible reason for wanting to do this, but if there is, I can't think of it. Granted, I'm far from a "power" pdf user -- if there even is such a thing -- but I've felt that Adobe Reader has been too bloated for a long time now. As such I've switched to using Foxit Reader.
The whole thing just reminded me of Zawinski's Law -
Every program attempts to expand until it can read mail. Those programs which cannot so expand are replaced by ones which can.
Maybe in this day and age, there needs to be an addendum to include RSS feeds.