I like Nibbo so much!
I've been even able to build and add my own Google customized search engine.
You can create your own from here: http://www.google.com/cse/
I think this is the best feature Nibbo has, since I could avoid Google's original search methods by filtering websites and promotions, of course I replaced Original Google search engine with mine version to work with Nibbo!
What I'd like to know is if were possible to add external search engines (not only Google and the others provided by Nibbo by default) and also external Video search engines and how to make them to show previews.
Also, I'd like to know if were possible to add a similar Image search engine to what Google is using (or implement /update it) for Nibbo. In fact, Image search engine method is still better in Google than Nibbo... but I know it has a solution!
Thanks Josep for your work!