The first rover...
Was actually the short-lived Sojourner, which delivered a stream of images to the internet and whetted our appetite for the more capable current-generation Opportunity and Spirit rovers.
Before that was Lunokhod, of course, but the images were'nt released in a timely fashion and there wasn't even an internet back then!
http://en.wikipedia.org/wiki/Mars_rover
And wasn't there going to be a Phobos rover once upon a time? Ah, it was a "hopper", not a true rover - on Phobos-2...