Some very high resolution Porsche desktops
 

This site, http://www.dieselstation.com has some very high resolution desktop pictures of cars, click on the Archives link, then select Porsche on the following page. They are generally 1600 X 1200, but just resize with Photoshop or whatever, for your monitor's resolution. That Mazda RX8 looks pretty interesting, check it out. Enjoy.

Those are definitely the best pictures I've seen on the web. The only others which rival them are the "wallpaper" shots on Porsche's own site. However, they only have about a dozen of them and they only cover current models.

I wish people posted more pictures out there in 1600 x 1200 resolution or higher. Resolution matters! ;)