IOS 6 opens RSS feeds in Podcast app - how do I prevent this?
Unfortunately, as far as I know (and that is usually enough ;), you can not change the default app that opens the RSS feed.
Personally I use the Downcast podcast app, to add the rss feeds from Safari to my Downcast app is as follows:


Go to the specific website and find you URL
Press and hold the rss-link you are interested in
Choose Copy
Now go to your RSS app and paste the URL