Question about drinking beers.

I'm fairly new to craft beer drinking, and I was wondering if you were supposed to "cleanse your palette" if you're drinking more than one type of beer in a session (if you're going for the taste that is). For example, if I started with an IPA, then wanted to drink a stout next, would it be a good idea to do something to wash away the taste of the first beer?

And if so, what is the best way to go about doing that?

EDIT: Thanks for all the replies guys. I can always count on (most) of you Beeredditors out there to help. Also, I just noticed a post from last night saying all these "new beer drinker" questions should stop being answered because they are mostly answered on the Newbie Guide. This guide is very helpful, but I did not see an answer to this question there. If I overlooked it, sorry guys!