There was Joost in 2008, from Skype founders. Skype was originally P2P until Microsoft acquisition and killing this legally questionable feature - need to feed the big brother (: Joost raised ~$50M.
I remember it as it was one of rare apps built in XUL, the same framework as Mozilla apps (Firefox).
PriitK of Joost/Sykpe was also involved in the original Kazza. I've told previous stories of his involvement in a 1990s MMO spaceship game, where he recreated the original buggy/cheat-filled client (Subspace) and released the now standard replacement (Continuum).
I distinctly remember living alone in my first apartment and trying to use Joost like a TV. It was a dismal experience.
Came to share this too. I used Joost at this time. Got me into watching the world poker tour on the platform and into playing poker and watching other live poker.
Skype's call quality was great when it was P2P. Went downhill when it was no longer on P2P.