Experimental version of Skype Mac includes indexed search for chats

You should back up your Skype user data, found in~/Library/Application Support/Skype/<username>, before you install the experimental version of Skype and start indexing your chats. Once the initial indexing process is over, you won't have to go through it again. Your chats will be added to the search index in real time. You'll be able to find them later by searching with whole or partial words and the boolean operators (like AND and NOT) that you're already familiar with from sites like Google.
Other features in Skype's experimental Mac app include sending your Skype "Mood Messages" to Twitter and enabling a new chat window using Command-N.











