I teach high school chemistry. Lab reports and other hwk are done on OOo writer, using the excellent (math) formula editor, then submitted to me through Moodle. I overlay my comments with text boxes and upload the response. Kids enjoy the paperless experience, and I never lose their work.
Unlike LaTeX, you can teach OOo formula editor in about 10 minutes.
We do real experiments. We do a bit of data logging and graphing, but not that much. There are some online java apps for things like gas laws and molelcular models that I use occasionally, but mostly real experiments.
When teaching theory, I use my laptop and type notes directly into a wiki on Moodle. Kids are then assigned to clean it up a bit later, and to upload any sketches I do in Kolourpaint. (They also maintain a glossary there and contribue their own notes to the wiki.) I often jump into Google images to find something that will illustrate what we are talking about.
We have some chem draw type software (linux stuff), but I don't use it much at all. Its faster for me to use kolourpaint (just a kids' paint program for the couple of you who don't know linux)