It would be good if there were a sticky somewhere that explains what different techniques does. Of course, people that visit these forums should at least know about Apache, HTML, PHP and SQL, and normally CSS and JS as well. But there are lots of other techniques that are being mentioned here, like Ajax, Perl, SSL, phpMyAdmin and some that are not so commonly mentioned like Tomcat and Python. I think that especially the latest techniques should be explained a little, it would be enough with something like:
phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web.
In other words, one or two lines for each technique just to get people to know what it is they really need. Then it is up to the person to search for more information and to learn how to use it.