Today I was able to put some nifty url validation into my feed reader. Almost as nifty are the tests I wrote to validate them.
I also created a Rake task to update all the feeds in the database. Rake tasks are also nifty, its very easy to access and modify models within them. I found a helpful intro to rake tasks here.
A final note: Rails Guides is a newly found resource for me. It was apparently updated to a new visual format this week and it looks great right now. There's some great, current documentation there that I would recommend to anyone looking to learn more about rails.