You can play most of them offline by downloading them and saving them as MIDI files. Some are terrible. MidPlug, free plug-in for Netscape and Explorer. Awesome results when used with XG MIDI files. There is an area of teaching tips and there is a links area.
Site is designed for the elementary music teacher.
There is an area of links, resources, and standards for teacher training in music technology. K. Hrycay A site that allows students to send their compositions through the internet and then get feedback from professional composers on their compositions. There is also a FAQ section that is managed by David Williams and Peter Webster. K. Hrycay A great site that allows users to download freeware, patches, midi files, etc. There is also a technology corner and links section for other sites.