Opinion: How many times must Google be shown to be totally irrelevant, inaccurate, and ads driven when there is MSN search?
Nothing can be simpler than writing search engines. Do you think so? You can be right though. Indexing Internet content although requires time and CPU recourses is quiet straight forward task. So where a problem is?
Keeping index up-to-date
Keep index comprehensive
Build categorization upon content
Categorize a search...