Wibiya has Google and local search (your blog search) and results are shown in your site, your site content is still remain.
Translate, Recent posts and Ramdom posts
For translation, Wibiya uses Google translate and Recent posts shows the latest posts with thumbnail. Random let your visitors to browse your posts randomly.
RSS, Share button, Facebook and Twitter make Wibiya widget useful for your blog. Share button allows your visitors to share anywhere like delicious, digg, stumbleupon, etc. Facebook fan and community tool allows Facebook users to become the fan of your blog and they can share any posts of your blog in their profile. Twitter tool, I find is that it is very useful because it allows Twitter users to tweet your posts instantly from your site that can get traffic for your site.
Wibiya is in beta state
Currently, Wibiya is in beta state but you can request to get beta invite (of course, you have to wait for a while). I added it today and will use it for sometimes to see the results.