The guys over at DS-Play, one of several large DS community sites, have rolled out a PC version of Pictochat
. Situated comfortably within your browser window, the program emulates the functions of the built-in DS program, namely sending text messages to others and displaying poorly drawn genitals. In addition, it also lets you save your supposed masterpieces for later viewing. It's not going to make you delete your current IM programs, but it does provide a neat little diversion, especially if your communication and artistic skills aren't hampered by the use of an imprecise mouse and fairly limited tools (you'll get 16 colors and you'll like it).
A word of warning, however: The very first crude drawing I was presented with involved uncomfortable bodily functions. These people are everywhere