1) Don't assign too many readings. I got carried away in my course design and assigned way too many readings. Readings are a bit like Powerpoint presentations in that, if you get carried away, they end up leading the class, not you. I'm sure the amount of reading I assigned (despite the warnings I received from seasoned instructors) reflected my insecurities. I had two 2-hour sessions per week. I wish I had assigned one or two really good readings per class and then included a list of recommended readings for all those articles that are really good but ultimately not as important.
2) No mid-term test, unless really necessary. It really depends on the discipline and the nature of the course, of course, but for an anthropology seminar like mine, a mid-term test was unnecessary. In fact, I think it made the students anxious for no reason. Ultimately, many did well and the test served the purpose I had intended: it gave the students the incentive to learn the materials and it gave me the chance to assess their reading and writing. But the same objectives could have been attained by assigning two Concept Papers instead. Besides, assignments are much easier to grade than tests! The single test was much more difficult to grade than the gazillion assignments. People just don't write as well under pressure, which makes grading like pulling teeth.
3) Do as little work as possible; get them to talk. This is not a cop out. It's actually really really hard! Seminars are all about talking... but not the instructor. After teaching this seminar, I've decided that lecturing is the easiest way to teach, but also not very interesting, especially in a seminar. When students don't talk---which they are known to do---it's a nightmare. And oh did I ever have nightmares! When students carry on conversations with one another... it's magic. Students learning from one another with you there to moderate is the best scenario I can imagine in a classroom. But to make this happen requires a lot of creativity in advance and during class.
The best class I had was in week 2 when I brought in images I printed from the Internet. The students got into groups to discuss one image then opened up to the larger class and just... talked. It was fantastic! And they really enjoyed it. It took a heck of a lot of time preparing (e.g. looking up images, choosing, printing, etc.) and a whole lot of work thinking on my feet to respond to and summarize the students' comments. So I did very little work in terms of getting them to talk, but to get to that point required a lot of work. Other methods I used were film screening, image slide-show, group activities and free-writing exercises. The students presented on their individual final essay projects and I made the presentations very informal so that they doubled as starting points for discussion in class. (Those were very good days as I needed to do very little prep, just "perform" during class.)
Final thought for today on teaching: grading. I hated grading when I was a teaching assistant and tutor marker but I hated it more as the instructor. At least as a TA grading felt like "part of the job" that I was doing for someone else, but as the lead instructor grading felt extremely limiting... and also irrelevant to my teaching. I had students who are great thinkers but are unable to articulate their thought into writing. Some students write beautiful analytical pieces but are weak at writing methodological sequences. Some students are really good at identifying main arguments in an article but don't fully understand reflexive thinking. Some students took risks that didn't always work but still they pushed their own limits. To compress all these different talents into one single grade that appears in their transcript is totally wrong and completely idiotic. As an employer, what is this one figure going to tell you about your job candidate?
I actually miss the grading system in grade school that assesses students based on different abilities, such as writing, reading, participation, arithmetic, gym, etc., that may or may not translate to subjects. I can assess undergrads based on reading, reflecting, analytical writing, critical writing, sequential thinking, creativity & risk-taking, linking with the everyday, etc. and still assign a value to their abilities. I'd prefer to not give grades but at least this way the evaluation scheme makes sense in the real world!