One of the most imoportant features in sharepoint 2007 is the enterprise search. Enabling search for extenral sites are extermely needed in any organization specially if the organization has other sites hosted on other platforms other than sharepoint sites.
To implement this, First make sure that crawling services configuration are set properly on your sharepoint "SharedServices" assigned to your site that you are working on.
From Central Administration:
- Select SharedServices.
- Select crawl rules.
- click on new crawl rule.
- set the url of your site, select include all items in this path.
Then click ok, wait till the next crawl service will run or run it manually, then you will get search results.
Hope this helps.