Weekend reading. Comic sans is a font that resembles hand writing. Released by Microsoft in 1994, it was made popular through its standard inclusion in its Windows and Internet Explorer software. Graphics designers (with the sympathy of the Vincent Connare, creator of the font) started a movement "ban comic sans" as early as 1999 to stop the font from taking over more and more print and screen space around us.
An entertaining summary of the history of the font and the efforts to put the genie back in the bottle can be found in this WSJ article.
What do I think? I agree that a comic-style font is not suitable for every occasion. When I have to use one, I prefer picking a more extreme comic font, like boopee. The problem with comic sans is that it is now so common that it has become boring. The same with Times New Roman...