Good explanations of how the dialectic works to trap people into participating in their own enslavement.
Example:
Freedom to smoke (THESIS) vs non-smokers rights (ANTI-THESIS) > "dialogue"...> new laws restricting smoking= limited freedom to smoke(NEW SYNTHESIS)
...then it restarts :
...Limited freedom to smoke (THESIS) vs smoking and health care costs (ANTI-THESIS)>...new workplace rules restricting smoking and increased taxes on cigarettes (NEW SYNTHESIS)
then it restarts:.....and repeats until there is no freedom left to pursue the activity.

We see this exercise played out in the MSM daily about nearly all aspects of our lives.

Other sources:
Anti-communitarian League has good explanation of the dialectic
http://nord.twu.net/acl/dialectic.html

Calverton School illustration of the dialectic
http://www.calvertonschool.org/waldspurger/pages/hegelian_dialectic.htm

For the Christian (definite Protestant slanted site, but good on the dialectic, the advent of Agenda 21 and global government and religion))
http://www.crossroad.to/index.html