Hi

Does anybody know of any extensions that have extended the basic umbraco search functionality?

I am looking for something that can do one or more of the following:

1. Predict search results, and break those predictions up into categories (eg. www.tripadvisor.co.uk)

2. Intelligent suggestions based on what a user searched when no / few results are found.  This would, for example, offer intelligent results for misspelt words and mis-entered product codes.

3. Ability match plural words with their singular. For example, if a customer specified ‘Readers’ as the keyword, the matching algorithm will not determine a match against both ‘Readers’ and ‘Reader’.

Any help much appreciated.