For some examples, ...check out various tools on SemWebCentral.

For example, you can browse the GForge project listing using OWL - more precisely, using an HTMLized version of the ObjectViewer.

I am a great fan of the idea of a semantic web. But I am afraid that it does not work in reality. As soons as it gains some momentum it will be hijacked by large companies (MS, Yahoo) trying to commercialize it and by small companies trying to misuse it (spam).

It seems to me like a meaningless concept. So far the biggest semantic web project I''ve seen is IBM''s WebFountain, which is basically a big sed script that goes through the web and wraps each stock phrase it finds with meta tags, and enters them in a big database. It seems like a reasonable phrase search would accomplish the same thing.

Ultimately, the question is whether people actually want to enable the ability to reuse and recombine their data.

Within your own data, tools to enable you to analyse and reuse your data are highly prized, but enabling anyone else to use your valuable data to their own ends benefits (almost) noone. (IMHO)