I absolutely love RSS format. It's one of the easiest ways for devs to get data and do something quickly with it.
If you remember, Yahoo Pipies allowed devs & others quickly build something with RSS feeds. I've recently rebuilt and launched my own Yahoo Pipes clone
Along the way of building this tool, I came across a plenty of major websites that do not provide RSS feeds and indie devs who maintain niche tools to provide these feeds.
Then again, RSS are still plentiful!