Like most of the stuff I've done on android, my most recent app, "Send RSS to Google Reader" came out of being frustrated that Google's Mobile Browser wasn't smart enough to detect RSS feeds, and also wasn't smart enough to allow you to subscribe to them in Google Reader's Mobile interface, except by doing some cut-and-paste gymnastics.
The first version required that you actually display an RSS feed (or find the link to it yourself), and then use the Android Browser's "Share this page" functionality to pass the url on to Google Reader by way of my little app. This was incredibly cumbersome.
Now, thanks to some Yahoo Pipes magic behind the scene, you can be viewing any web page, hit the 'Share this page' menu item, select "Send RSS to Google Reader" and it will auto-detect any RSS feeds that happen to be part of the page. If there is just one, it sends it over to Google Reader Mobile where you can subscribe with a single click. If there are more than one, you are presented with a list of them, and can click any one of them to send it over to Google Reader Mobile.
Here's a demo video: