It sounds pretty neat. I gave it a shot tonight, and had to work out some compilation issues. I had a version mismatch between soprano and qt4, then I needed a newer version of kbibtex. At that point, Nepomuk blew up, which slammed my computer and made it freeze for several minutes. But eventually, I was able to get Conquiere running.
Conquirere allows you to add bibliographic data such as journals, books, proceedings papers, articles and many more to Nepomuk. Combine this data with the documents on your harddisk or some online storage and helps you to organize your data to quickly find some parts of your research again.
For being new software, there's a lot of functionality and polish! Jörg Ehrichs has done a great job of organizing things. The icons are colorful, the search is full-featured. I really look forward to seeing how it continues to develop.