Below you will find the current list of search engines to enter into your settings page for search engine tracking.
There are a lot more than this, however these are the ones we feel are worthwhile tracking.
If you watch the user agent section of your log files, you will notice some show up which are obviously spiders. If you run a search on Google for the user agent, you will find whether they are or not - and whether they're worth tracking.
Select the search engines you wish to add, hit 'create list', then copy and paste them into the search engine textarea at the bottom of your settings page.