Go to
www.sidereel.com/Desperate_Housewives and they give you links for sites where you can stream/download DH.
If you haven't got divx I'll suggest you download it, as that streams the show in the best quality. Go to
www.divx.com, then download the newest edition, it only take a few seconds and shouldn't slow down your computer in any way.
When you got divx, try out this site
www.ninjavideo.net, it is the best site to watch all your fav US shows in divx. A couple of hours after DH aired on Sunday in America they had the epi on their site. All you need to do to watch their videos is to get the
http://www.ninjavideo.net/helper.php. It is a similar style download to divx, and it helps to make your divx faster.
If you do all that {it sounds long, but only should take a few minutes top}, then you can sit back and enjoy your DH fix. BTW ninjavideo only has episode 12 onwards. But C4 will pull it after episode 11 so that is the only ones you should need.