Along with MTV, both MySpace and E! are going to provide live coverage of the Eclipse premiere! Here's the announcement about MySpace:
MYSPACE TO HOST LIVE STREAM OF SUMMIT ENTERTAINMENT’S
THE TWILIGHT SAGA: ECLIPSE PREMIERE RED CARPET ARRIVALS ON
THURSDAY, JUNE 24th

Viewers Worldwide Can Pose Questions to the Cast Live On the Red Carpet at the Los Angeles Film Festival

LOS ANGELES – JUNE 15, 2010 – MySpace will host a live stream of Summit Entertainment’s The Twilight Saga: Eclipse red carpet arrivals at the premiere on Thursday, June 24th at www.myspace.com/twilight. Moviegoers across the globe will be able to experience the red carpet first-hand and in real-time. Viewers will also be able to take part by posting comments or questions to The Twilight Sage: Eclipse official MySpace page that may then be presented to the celebrities during the broadcast. The red carpet arrivals will stream live from the Los Angeles Film Festival beginning at 5:30 PM PT.

The video player will be embeddable allowing for additional outlets to carry the broadcast. The live stream details are as follows:

WHERE: The Twilight Saga: Eclipse Official MySpace page: www.myspace.com/twilight
DATE: Thursday, June 24
TIME: 5:30 PM PT

And here's the official announcement from E! online:
The big week is finally here! The Twilight Saga: Eclipse premieres this Thursday June 24. Scream! What will Kristen Stewart wear? Will she and Robert Pattinson interact? Hold hands? Exchange knowing eyes? Will Taylor Lautner's smile be whiter than ever?!

These are all very real and very important questions which is why we're excited to announce we will be live streaming the entire red carpet right here on E! Online. We'll get the show going at 5:30 pm PT/ 8:30 pm ET, so head over here and don't miss a second of the action.

We'll also be asking the Rob, Kristen and the gang your questions so tweet us @RedCarpet and let us know who and what you want us to ask!