Copernic Desktop Search 2.0 Beta is now available here.

Here's my one sentence review:

I would highly recommend it -- if you need a desktop search tool.

Some details about why below.

I posted recently about how I was using an earlier version of their desktop search product here .. and they've addressed most of the dislikes I had about the first version. (Still some to go though ... )

I like the combined search results quite a lot (there's still the old method of selecting a particular type of search, such as e-mails, files, etc.). It's blazingly fast even with a TON of e-mails and content to search (I include in the index a shared network music and photo drive and still find it's fast). I love the built in preview window with the search word highlighting (and the fast method of jumping from one result to the next by clicking the search word). (Yes, I know it isn't original at all, but I still find that feature very handy). It works well on the file types I typically need, such as Microsoft Office documents, PDFs, source code files, etc. (I don't know if there's a list of file types anywhere).

On my wide screen, I have it set to show the preview on the right side rather than the default bottom.

It's still a larger application experience (a full screen experience would probably be common), but you can use the included deskbar to quickly search for keywords as well.

It searches source code files -- anything you want. The one gotcha you might encounter is if you're searching for words (or programming language constants) which contain an underscore. If you search for WM_LBUTTONDOWN for example, Copernic treats that as two words: WM and LBUTTONDOWN. Add quotes to search it as if it's a single word.

In a funny irony -- I went to their Search Help Zone (accessed via the Help menu) to find the list of file types that can be previewed/searched. I couldn't find it -- they don't have a search feature in their online help system!