Forum Moderators: open
And if you take web directories into consideration, You really need to observe the crawl of a particular category page, but that is out of question, considering that most sites are submitted to many directories.
[webmasterworld.com...]
(Directory Listing Hijack Detection)
[webmasterworld.com...]
(What criteria to check when deciding to submit to a free listings directory?)
Both the threads give interesting information to carry on your research.
Cheers,
Ravi.