Welcome to WebmasterWorld Guest from 126.96.36.199
38.98.19.## - - [21/Jan/2007:03:54:12 -0500] "GET / HTTP/1.1" 200 3816 "http://www.apassion4jazz.net/" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:188.8.131.52) Gecko/20060909 Firefox/184.108.40.206 SnapPreviewBot"
Took every file from index.html including images, scripts, css. No request for robots.txt. Changed IP address D class each request.
I could see in my logs hits coming from 38.* IP addresses with the user agent "Mozilla/5.0 (compatible; SnapPreviewBot; en-US; rv:220.127.116.11) Gecko/20061206 Firefox/18.104.22.168". The page and all graphics and stylesheets were downloaded, including favicon.ico, but robots.txt wasn't requested.
So it doesn't seem to be a standard spider as far as it doesn't actively crawl a page until someone tries to view the preview image.