Very prolific on cable networks and amoungst IRC lamers, denial of service attacks against the windows TCP/IP stack have become increasingly common in the past few years, starting with the now famous winnuke attack, which just happened to appear at the same time as the internet became popular amongst the masses, and according the 15 year old script kiddiez.

That's not to say that it's a windows only problem, for example Teardrop effected linux as well, there was a BSD attack in late 1998, and Sun attacks have existed for years. It's just that windows has a lot more of them of late, partially due to a poorly designed TCP/IP stack, partially due to it being the most popular target