Search in 2010 has many improvements when compared to MOSS. Few enhancement that I am aware of:
Wildcard Search
Logical Operators Search
Faceted Search
There is a nice article which explains these concepts with simple example.
http://sharepointchick.com/archive/2009/10/19/whatrsquos-new-for-end-users-in-sharepoint-search-2010.aspx
There are few more enhancements which are described briefly below.
Phonetics
It is common for end users that they might not aware of the exact spelling of the person who is being searched, but they know how it souds phoneatically. The query engine in 2010 has phonetic search capability for searching for people. As long as the spelling sounds like the name of the person (such as searching for 'Reena Sen' whereas the actual spelling is 'Rina Sen'), the engine will find the right person.
Rich Previewing (with FAST)
2010 provides rich previewing of content by leveraging the integrated FAST technologies. With this, when an Office document is returned in the search result, the users can preview the document. Instead of opening the document to see if it is the result they wanted, they can just preview the document, and then open it if they want to, which saves time for the users.
Suffix Matching
By using the wild card search, we can search for a word by appending * at the end of few letters of the word. For example, search for 'depart*' will return the contents matching with the word 'department'. An additional advantage here is matching of suffix in wild card search. For example, if you search for 'Marketing depart*', the search engine will recognise the suffix as well and return the results which are matching the word 'Marketing department'.
Address book style lookups
People Search in 2010 supports address-book- style lookups which allows you to type an alias for someone and quickly find the person you are looking for.
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