The latest version of Searcharoo (4) is now available for download (and read about, of course) --
C# search engine: refactored to search Word, PDF and more.
The coolest feature - searching Microsoft Office docs (Word, Excel, PowerPoint) and Acrobat/PDF files - is based on someone else's article Using IFilter in C#.
Also put a bit of work into refactoring the code structure, layout, naming, etc. At least now it might pass a "code review" (if anyone cared to conduct one:)
The project now also has it's own website www.searcharoo.net - the latest article isn't quite there yet (requires some formatting) but over time I'll post more frequently to that site; it takes forever to write, format and upload decent, CodeProject-quality work...