There's nothing particularly bad for SEO except outright keyword spamming, link farms and all the scam related SEO techniques. In broad strokes, the trick to organic search engine optimizing is to do things that improve your site content to make it more valuable to search engine rankings.
That said, adding descriptive information to links via the title tag makes your content more useful than it was prior but it isn't the be-all-end-all to SEO. I've long felt that for SEO, content is king, meaning that you need to write compelling and useful information about the subject your site is about. If you have a table full of links, you will also want to have a paragraph above that list of links providing some context so that the search engine indexing algorithm can evaluate and index your content against other similar information in the same subject.
If you want to get into more SEO info, I would check out the [Internet Marketing Section of the site. I know the basics of SEO which are really based on common sense but I'm sure you can find real expert advice over in the [URL="http://www.sitepoint.com/forums/forumdisplay.php?2-Internet-Marketing"]Internet Marketing Section](http://www.sitepoint.com/forums/forumdisplay.php?2-Internet-Marketing).