Quick one: if you’re placing backlinks on sites for SEO purposes and you’re at all worried about over-optimisation, this technique may be useful to you:
<a href="http://www.isvirtual.co.uk"><?php echo rand(0,1) ? "Website design" : "Web Site Design"; ?></a> and <a href="http://www.isvirtual.co.uk/seo-cambridge.php"><?php echo rand(0,1) ? "SEO Cambridge" : "Cambridge SEO"; ?></a> by <a href="http://www.isvirtual.co.uk"><?php echo rand(0,1) ? "ISVirtual" : "IS Virtual"; ?> </a>
You get the idea. Of course you could spin more than 2 varations of each.
You’ll want to “lock” the randomisation too. Before the first call to rand() use:
<?php mt_srand(crc32($_SERVER['REQUEST_URI'])); ?>
If you’re very cautious or backlinking a big site, you might want to use “vanilla” variations like “click here” too 
Hope that’s useful to you.
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