Boost your search with multi-media content (pdf, .xls, .doc), facet filters, autocompletion, suggestions, and optional hosting
This SEO plugin offers keyword suggestions, taken from autocomplete google, yahoo, bing... up to 250 keywords ideas
Instant WordPress search with search suggestions for tags, categories and titles.
Version: 1.0 Enter a seed keyword and this tool will let you browse down a tree of longtail keyword suggestions.
IndexTank hosted, realtime search (FTW!)
Add OpenSearch standard support for search clients to your website.
Help cure writer's block by getting suggestions from your readers with this plugin.
Suggests tags for a post using the Flaptor Tagger API
Tag Suggest Thing uses the Yahoo! term extraction API to find tags to suggest.