Teaching while doing a PhD If I have understood correctly, most people doing their PhDs do their best to avoid any teaching duties while in their programs. However, I think I might want to do some teaching too. Of course, I have a hidden agenda. I would hope that:


Usually, (good) skill to teach is required later on your career, when applying for tenured positions. I would receive good experience.
Giving lectures related to my research topic might get someone interested about it. I could delegate some minor (boring :-) part of my research topic for someone to do as his/her master thesis.


Am I hoping too much here? Any experiences?
Most doctorate programs have some amount of teaching/ta/facilitator/etc as a requirement of the program. Some people try to do more, some try to do less, but unless you're working in a research lab (with its own endowment :-) expect to do some teaching. 


Re 'good skill': if your goal is to find a tenure track position then yes this would be good experience.  Assuming that you enjoy teaching, and who here doesn't grin, this would be a good opportunity to enhance and refine your teaching skills.
Re 'lectures on research': be careful here.  Odds are that any teaching roles you would be offered at this point in your academic career would be pretty low level undergraduate type stuff.  Depending on your area of research you might also run into some problems 'presenting' un-vetted data.  There are always exceptions to the rule but I wouldn't expect for you to be teaching anything so specific that your research would come into play.  YMMV but that has been my experience (since you asked).
Suggestion: Be careful with overloading your schedule. Teaching is one of those jobs that finds a way to embed itself in many aspects of your life that you didn't expect. For example: I expected to spend my middle years sitting on the porch reading books with my wife, not reading term papers.  Oh well.  While it is good to gain experience you don't want to spread yourself too thin and suffer an impact to your research (remember, the reason you're here in the first place :) or your personal life.