In our industry, there is a competitor who is now ranking #1 on many core keywords and they are using hidden text at the foot of their page. Same colour text as the background and it only appears when you mouse over. Its incredibly small - but from all I know this is a very old black hat SEO technique.
I have submitted a webspam report via google, but its been months and nothing. Any other suggestions/ ideas on how to combat this?
Thanks