For those needing the best RSS and Atom parser on the net, SimplePie answers the call. It’s light (one file) yet powerful enough for almost any job. (Float like butterfly, sting like bitch.) The documentation is amazing and the community of people backing it far exceeds anything else. OMG did I mention the caching feature??
When it comes to RSS parsing, I’ve been around the block – Magpie RSS is too complex, packed with features I’d never use. And Last RSS works sporadically – loving some server configurations and hating others.