Well here goes.

A bubbler is a piece that has a chamber that is filled with water, which the smoke passes through, in a way its a mini bong. here are some pics.

http://images.google.com/images?q=gl...=Search+Images

A Bowl is pretty much just a pipe, there are several different variations, iincluding hammers, spoons, sherlocks etc. Bowl pics

http://images.google.com/images?svnu...es&btnG=Search

And Lastly smoking out of a vaporizer, has basically the same effect of smoking regularly, however less or no smoke is created. The vaporizer heats the weed to the point of evaporation, and you inhale the fumes. This is considered less harmful than inhaling smoke.

http://www.onlinesmartshop.nl/images/vaporizers.jpg

hope this helps ya man. Also check out Wikipedia, they have all types of info on everything. :smokin: