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The problem is that it is something that wouldn't take much adjustment to pick up. Anytime an SEO trick becomes widely known and frequently used, SE's tend to make adjustments to try and catch offenders.
If you really need to set invisible links on a page, you would probablly be better off using an image file to set your background color rather than writting it into the html. If your background is a tiling gif file that is white, and you placed links on that page in white, there really isn't any way (that I know of) that a spider can tell what color the image is.
I'm beginning to think that this is always the best practice. Color rendering matches more consistently with other graphics on the page, accroos various hardware and software.
I've been using robots.txt for css an js files. The cgi-bin is great idea -- thanks!
I don't usually try anything very shady, but when search engines do begin to address such issues, their first shot at an algorithm can take a lot of innocent bystanders down along with any abusers it catches.
I've been burned in the past by placing white text over a colored table cell background in one part of the page. When the SE looked it just read white text on white bgcolor and nailed me. I won't invite that again.
Right now I have one script that starts DHTML elements off the page. The functions that move them onto the page would be hard to analyze, but that funky starting position might just jump out.
The method I employ is to redefine html tags - I don't like the clunky sized h1 tags so i resize them to fit in with the rest of the page - but there is an awful lot of room for abuse with this method, I envisage that search engines will be working on this as we speak.