I'm involved in the development of this script. I'd be curious to know what some SEO literate people think about it.
There are likely hundreds of sites running some prior version of it, since its based on PHPLinks but we have added some features like...
session ID supression on detected search engine spiders.
optional featured sites function w/ site thunbnails.
site reviews.
I can attest that the session ID supression works, since google completly spidered the working demo at
http://www.dew-code.com/links/
The primary function of a directory/link exchange package like this is to increase backlinks to the sites running it, but I'm curious, what other SEO methods might we be able squeeze in there? Latest version, currently 2.0.1.0B, is here
http://www.dew-code.com/modules/mydownloads/
What do you think? Is this worth continuing development on. or is there already something better out there w/ GPL liscensing?