As a consultant to enrich the end user experience on maansu.com, we are working on implementing auto suggest feature on maansu. At maansu, we leverage the power of Lucene to make the user experience better. When we had to implement auto suggest, we leveraged the Termscomponent handler for auto suggest. Thanks to open sourcing of solr, we a small band of engineers were able to provide the complicated feature of auto suggest in couple of days.
Some other reference url’s to get this feature working are http://www.mattweber.org/