Can you put a webpage on your desktop?

Do you mean shortcuts to web pages?

Windows 7 Desktop Integration with IE9

Internet Explorer 9 - Pin and Unpin Websites to Taskbar or Start Menu

Internet Website Shortcut - Create

google chrome uses a shortcut and gives you a choice of three locations to put it its called "create application shortcuts"

left click the wrench at top right at the extensions bar > mouse down to tools > left mouse to the "create application shortcuts" > and choose what shortcuts you want (for the website you are currently on) desktop - taskbar - start menu

you mean to capture the picture and use as a desktop wallpaper?

I think he means embed a browser as your wallpaper

In XP, I think it was called Active Desktop and you could designate a website to be the wallpaper for your desktop or you could have it as an object similar to Vista/Win 7 gadgets.

To get to your question, I don't know if it is possible with Windows 7. I'm on a Vista computer right now and I'm trying to see if it is possible right now.

Update: For what it's worth, I did a search and found an article on Wikipedia stating that the Active Desktop feature was removed from Windows beginning with Vista.

Article here: http://en.wikipedia.org/wiki/Active_Desktop