Second Life search engine allows residents to search for a particular information in Second Life:
Most residents use the "All" tab which search through all objects mentioned above.
LL claims it may take up to three days for results to actually get indexed, but usually a parcel gets indexed in 24 hours, and changes are being re-indexed in 12 hours.
SEO: Raising your parcel positions
There are several ways to uprise your business position within SL Search. It's explained in details in a separate article: SL Search Promotion.