…19 year olds can put up an engine with some nifty features. Check out FyberSearch.
This engine allows the user to tweak the keyword density portion of its
relevancy algorithm. I haven’t seen this option from a general web engine,
I like it! You often find this feature from databases like LexisNexis and
Factiva where the searcher can specify how many times a word or phrase
must be mentioned in a document to be considered relevant. Often, the
syntax atleast(x) is used. An advanced interface and image searching are
available. You’ll also notice a link (on search results pages) to
immediately reindex each page. Finally, options to limit your search to
terms in the title, meta tags, and url by simply pointing and clicking.
The default search finds your terms in page titles only. You’ll need to
select “content keywords” to search terms on the page.