After setting up a new SSP in a new farm we kicked of the search crawl from the standard "Local Office SharePoint Server sites" content source. We had a lot of content to crawl so we anticipated it lasting a couple of hours. What we did not anticipate was it still running in the morning when we had come in the night before.
When checking the crawl log there was nothing returned.
The crawler appeared to be stuck on "Crawling Full".
Solution:
A glorious IIS reset and a recrawl. I appreciate this might be a somewhat trivial point but if you have neglected to do one recently it might be worth giving it a try before you attempt some of the more elaborate solutions online.
SharePoint is a state of mind.
