Would you please confirm that it is not possible to add an arbitrary RSS feed to Flipboard on my iPad? I find this so hard to believe that I'm in doubt I missed something...
Actually you CAN load a specific feed to Flipboard. Start by adding Google Reader. Then launch into it, and click on the downward facing Triangle next to the headline "Google Reader." It will then pop up a window showing you your various feeds. Select the one you want, and its name will appear as the new headline and you will only see stories from that feed. Then click the little "+ content" symbol in the upper left, and it'll add just this single RSS feed to your main flipboard page.
You are correct that you cannot add an arbitrary feed, and as @Mike Scott noted, you have to add your entire Google Reader account.
Frustrating because Flipboard is absolutely not a good way for me to read the bulk of my feeds -- Reeder is perfect for them -- but I'd love to add a few feeds that I rarely read to Flipboard, feeds that fit its visual style.