A point that seems to have been missed is whether that link would help your
visitors. Sod the search engines, if the link is useful, include it; if it isn't, don't.
Search engine algorithms aim to select the sites which have the most useful content. Being stupid machines, they don't always succeed - but they are getting better all the time. You can either build a site aimed to please the search engine robots, or one aimed at people. The former
may bring short-term benefits, but you'll be continually tweaking your site to keep one step of the robot algorithms. A people-friendly site will win out in the long term, because people will pass your URL on to their friends, put links on their own sites, give you repeat business, etc.
OK, so the two approaches aren't mutually exclusive. You can design for people without locking out the robots, and many things you can do will help both. Making sure your site validates as standards-compliant (X)HTML will stand you in good stead, making your site accessible to people with disabilities will also help robots - they effectively use text-only browsers to visit your site.
If you're thinking of spending time adding comments, meta tags and other hidden gew-gaws to enhance your pages' standing, consider whether it would be better spent...
[ol]
[li]Adding new content to your site - the more content there is, there more there is for people to use (and robots to index).[/li]
[li]Exchanging links with other relevant sites - helps people find your site (and "link popularity" is an important factor in Google and other SEs)[/li]
[li]Hanging out on discussion forums and shamelessly plugging your URL (just kidding, Ristmo!)[/li]
[/ol]
With option (3) in mind

, I'll mention one of my own sites,
. It ranks 1 on most engines if you search for "McGonagall", and top 5 if you search for "William McGonagall". I've done very little search-engine specific work to get this, I've just concentrated on building the site, made it XHTML compliant and as friendly as I can, and put a lot of time into getting people to link to it. It seems to have worked out!
</rant>
-- Chris Hunt
Extra Connections Ltd
The real world's OK for a visit, but you wouldn't want to LIVE there!