I thinks that Yahoo SLurp! is stupid crawler, because he don't follow with rules in robots.txt. For example: I was restrict access for all crawlers for few files:
Code:
Disallow: /attachment.php
Disallow: /cron.php
Disallow: /newreply.php
Disallow: /newthread.php
and all crawlers are follow with this instructions and don't call this files, but Yahoo Slurp! is still call this files.
Also, few days ago at my board was online ~125 Yahoo Slurp! crawlers (each 2 seconds come new Yahoo Slurp! crawler) - I think it was tempopary bug with crawler