Car Rental USA

[cattlikewoah]

Hey Guys,
I'm thinking of hiring a car for my Canada/USA trip next April.

I was thinking of either:
Hiring a car and driving from Toronto to Austin TX (stopping off everywhere in between).

Is there a way you could hire a car from Canada and drop it off in USA? (Any companies to recommend?)

Also thinking of hiring from Las Vegas and drop off point in San Francisco...

I've also read (last time I was there) that some cities do this thing where you can just pick up a car from a certain point and help "move it along" to its destination or something... I forget what it was, what the company was.. I think it was in New York or San Fran that I saw the adverts or read the article. My friend heard the same thing - any ideas on what that is?

Thanks!

Steph