Edit:
I have had problems with BotCheck preventing trackbacks. I have deactivated it and try another plugin. More on that issue here!
You find an update on this issue here:
BotCheck 1.1 fixed

I am using BotCheck to prevent comment spam. This works fine in WordPress 1.5. I had to do some small changes to get BotCheck Version 1.0 work in 1.5
You have to change the comments.php-file in your current theme directory. My comments.php look like this:
comments.php
So, it works and I am happy, but BotCheck is now upgraded to version 1.1. So, I tried to upgrade, but got an error:
Parse error: parse error, unexpected T_ELSE in
…../wp-content/themes/wwweiriksocom/comments.php on line 98
Somebody at some point said “if it works, don’t fix it”, so I am back to version 1.0 with the fix in my comments.php mentioned here.
I will check back to www.blueeye.us to see if someone replies to my comment. I have probably done something very stupid, and the fix is probably very easy…
I have now installed BotCheck 1.1 with the latest fix. It seems to work perfectly well…
Hei Eirik. Så du var inne på siden min og tipset meg om botCheck. Dette er en meget nyttig liten sak som jeg kommer til å bruke på mine sider også med tid og stunder. Takker og bukker. For tiden forsøker jeg å sette meg inni i de ulike funksjonene i css stylen og da blir det mye ekperimentering med ulike design. Begynner å få oversikten nå, så snart ender jeg vel opp med et design jeg er fornøyd med. Ellers er jeg innom sidene dine av og til også og finner mye interessant. NB! har laget en hjem link i horisontalmenyen min. Så nå kommer du lett frem til forsiden.
[...] 1. You want to stop possibilities of any comment spam There are several ways to do this. I like a plug in called Bot Check. It makes a authentification image with a random number that the person posting a comment needs to enter. This far, I have not had any comment spam as long as Bot Check has been running. You find a Guide to BotCheck here. [...]