In case you missed it Aaron Wall added a rather comprehensive search engine marketing glossary to his SEO Book site.
Reuters Financial Glossary Wiki
Reuters is hosting a Financial Glossary Wiki, a fascinating case study for the way enterprises will host professional communities.
Glossary of Search Engine Ranking Terms
Here is a glossary of commonly used terms in the world of search engine ranking.
Glossary of Web Design Terms
Following are definitions of terms related to the Internet and Web design. If some of the terms have several meanings, we are providing the meaning that is related to designing, navigating, and promoting Web sites.