Suggestive Search - When you type into the search box, a list of suggested names from your contacts pops up. You can select one of the names without having to type in the whole thing. I think this might come in handy when you're having a hard time remembering a name. Maybe you remember the first letter or the first name, but the rest of it just isn't coming to you - this can help.

Streamlined Search Results - LinkedIn changed the design to make it easier to scan the results. They also added photos. Results can be sorted by relevance, which includes the social graph, or by relationship, relationship + recommendations, and keyword.

Customizable Views Users can determine what info they want returned in their search results. Just click the "Views" drop down menu (next to the "Sort" drop down menu at the top of the results). You can decide whether you want to view headlines, photos, locations and more of the people returned in a search.

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