If you are having problems registering a new account because of the forums captcha system, click the link next to the captcha box and it will read out the letters/numbers as a sound file. I know the captcha system can be a big pain in the arse, but it helps keep the spammers and email harvesters to a minimum.
Had a whole lot more hack attempts today, I've backed everything up and put some new forum firewall software in place. Will just have to site back and see what happens. At least i have backups this time! :D