Searching company site for information

Lately I have found an interesting tool sold by google.com and called Google Site Search. As you can expect by google.com it is a search engine, which you can place on your website. Starting from $100 a year and offering the best widely known search engine it can be quite an interesting offer for many big and complicated sites. This feature offers searching: synonyms, by date, documents no older or no newer than and many many more. Subscriber has access to statistics of what words are searched most often and can also weight documents by age - so newer can be weighted higher or lower - as demanded by owner of website. There are many other features and it is worth consideration if you compare low cost of this service with its huge usability and high cost and difficulty of writing such a service by own.