Getting RDF data on the web can be hard to convince people to do, or to do correctly (see RSS). This service helps convert formats as need be and lets you access embedded RDF via GRDDL (such as microformats when they have a transformation) without the need to pre-process it yourself.
Everything that Triplr generates is available via a simple GET at a URI, so you can cut and paste them, ‘wget’ or ‘curl’ them and thus easily get the data into into your own web application without additional code.