This is an old trick and many of you will know it but, for the noobs out there: This doesn't work on all sites because of differences between platforms, but it's generally worth trying out when you're hitting a really nice PR6 or 7 but suspect you'll be spotted and removed quickly. It changes the link color to black, removes the underlining (if any) and prevents anything from showing up when the link is hovered over by the cursor. These links are treated as normal by search engines, and some of these are expected from normal users. In other words, it's not obvious cloaking and won't have any repercussions in Google. Good luck.