On many occasions I have needed to use an image icon within the title of a given web part; this dresses up the web part and adds visual appeal. Historically, I have addressed this either using styles (with an image background) or a content editor web part (and setting the chrome to none on the web part in question) to get the desired effect. This has always been somewhat painful and I was surprised that Microsoft hadn't addressed this. Well, they had - I just didn't know it. :)
On a project last summer I stumbled upon the Title Icon in web parts...I had never noticed it before!! For those of you that had, to some degree, ignored the Advanced settings of a web part - this is where you will find the Title Icon (and yes - this is super duper easy).