Linspire has broke a lot of ground when it comes to getting Linux into the main stream. I've been doing research on ISPs, and the few major providers that actually support Linux tend to only support Linspire. As a non-Linspire user, I find it a bit frustrating, yet I also find it very interesting.
Also under their belt:
The first to sell whitebox machines at Walmart
The first to come out with cheap Linux-powered tablet PCs
They also have a $500 laptop at Walmart which apparently sells so well that it is constantly out of stock.
There is a lot of criticism out there about Linspire's interaction with the Linux community at large, and also justifiable criticism of forcing newbies to run as root (are they still doing this?), but I don't think there has been a single other company that has pushed Linux harder into the world of the average consumer than Linspire. For better or for worse, they are the FACE of Linux to many.
Moderator's note - Moved from the Book section