Ok, I got a semi-tedious taks to look at a search engine for documents inside an intranet site that we have. So, lets say, we have an Intranet where reports about meetings can be stored (Word .doc files), and we want to be able to search the word files withing the intranet. I think the google appliance does this, but it is a bit overboard to buy a new appliance for some users, thought the users that will use this feature are very important in the company.
Well, we have the advantage that our web server runs on Linux, with apache and php, so there should be something open source that we can integrate it