I announced an RDF browser some days ago and I have more thoughts about this issue:
A generic RDF browser is not possible.
an RDF browser is possible, but it needs stylesheets.
It cannot be made, it will not be good and it is not needed.
A generic RDF browser is a piece of software that will display RDF like a web-browser. You can see it, read it, click it etc. It should generate a good representation of the contents, but without any rendering instructions (like css or xslt)
XML is also not rendered in a generic way. Never. IF you see xml, it is usually rendered using an XSLT to render it as HTML. But for each XML-Schema you will need a seperate XSLT.
The same with RDF: to render RDF, you need a kind of XSLT for every RDF-Schema around. So what we need is people like Masahide Kanzaki who do great XSLTs for RDF.
And a way to use these XSLTs. They may not actually be XSLT, it also may be a kind of XForms idea. We also need to use the RDF extension for XSLT (f.e. Damians Treehugger).
So: Do not try to make a generic RDF browser. Try to render the concrete RDF example you know of. Build something like FoafNaut.