Also, we have been using the already mentioned bot-trap from danielwebb.us/software/bot-trap for some time now. Since legitimate users can unblock themselves, it really doesnt hurt to use it.
Forgot to mention: I had to change functions.php to make this trap work.
$new_fp_name = tempnam("sys_get_temp_dir()","bbo"); $new_fp = fopen($new_fp_name, "w"); if (!is_file($new_fp_name)) { echo "<p>File $new_fp_name doesn't exist, can you create this file?</p>"; return; }
Greetings Stip