Advanced Technology Group (ATG) IT Shop
Purchase discounted test vouchers for all Microsoft and CompTIA certifications including MCSE, MCSA, MCSD, A+, Network+, Server+, iNet+ and others with ATG's easy registration at any Prometric testing centers nationwide.
http://www.store.yahoo.com/advanced-technology-group-atg

Bad Dog's Training Planet
Offering a wide variety of vendors for training and certification for MCSE, A+, Cisco, Java, Oracle, and CIW. Online, CBT, Video and Nationwide Boot Camps offered.
http://www.trainingplanet.com

BeachFrontQuizzer
Practice tests for popular certifications.
http://www.bfq.com

Boson Software
Practice test software for the MCSE, CNE, CCNA, and CCNP certifications.
http://www.boson.com

Guiding Principles for Faculty in Distance Learning
A set of principles that define good practice and clear benchmarks for faculty as they pursue activities in distance learning.
http://www.ihets.org/progserv/education/distance/guiding_principles