Strange bot keep on visiting my site and don't obey my robots.txt file

What to do?

[Compworld]

The following bots keep on visiting my site dispite my rules in the robots.txt file. Here they are:

Firefly
AspSeek Robot
Firefly
Szukacz
www.cj.com
psbot
libwww-perl
Internetseer Robot

What do I do?

Thanks,

CompWorld

[rogerd]

Ban bad bots in your .htaccess file. The major SE bots usually follow robots.txt, but linkwalkers, e-mail harvesters, test bots, etc. usually don't even check robots.txt.

Here's an extensive discussion:
[webmasterworld.com...]