I also use PlayOn to access online content from my PS3. It provides a really great interface for navigating the entire Hulu site, plus supports CBS, CNN, ESPN, Netflix Streaming and a couple other stations. There is also a user-run community called www.playonplugins.com
that offers a variety of plugins for PlayOn that add support for podcasts, as well as other internet media. Food Network and Red Tube (someone mentioned porn) are both available as plug-ins.
TVersity Pro is also dabbling in online content streaming, but their functionality is neither as polished nor as stable. They do, however, have a few channels that PlayOn doesn't, assuming you can actually get it to work. It's a beta, so I suspect it will get better over time.