He's the Friend I like the most out of the six, so I wanted to start a topic about him. (Also, I'm hard-pressed to think about good taglines for the other five.)
I was totally struck by Roger's (Phoebe's squeeze in "The One With The Boobies") observation about Chandler: "I wouldn't wanna be there when the laughter stops". This is because my love for Chandler is in no small part due to my similarities with him, like using sarcasm and humor as a front for his insecurities. That's why I was really glad that Monica eventually did hook up and then marry him. My personal fanwank is that the reason Chandler became less snarkier as the series progressed was due to him no longer having to be so snarky, due to his relationship with Monica.
So, discuss Chandler Muriel Bing here.