Apparently because of 'Invalid clicks' my google adsense account has been banned. I'm a little dissapointed to say the least, as far as I know I've done nothing wrong. Here's a copy of the email they sent me.

Hello David Marshall, It has come to our attention that invalid clicks have been generated on the Google ads on your site(s). We have therefore disabled your Google AdSense account. Please understand that this step was taken in an effort to protect the interest of the AdWords advertisers. A publisher's site may not have invalid clicks on any ad(s), including but not limited to clicks generated by: - a publisher on his own web pages - a publisher encouraging others to click on his ads - automated clicking programs or any other deceptive software - a publisher altering any portion of the ad code or changing the layout, behavior, targeting, or delivery of ads for any reason Practices such as these are in violation of the Google AdSense Terms and Conditions and programme polices, which can be viewed at: Publishers disabled for invalid click activity are not allowed further participation in AdSense and do not receive any further payment. The earnings on your account will be properly returned to the affected advertisers. Sincerely, The Google AdSense Team

Needless to say I have appealed against this, things had just started to get going and I was earning enough to pay for my hosting. The chances of getting it revoked are slim at best, but it's got to be worth a try.