While I'm not involved with the launch in any way, whether or not this spacecraft launches today (6/22) will determine how I spend the first few weeks of July. Watch it on KSC Realvideo Feed One.
You can also get a closer look on Feed Two.
And, while they're not showing anything worthwhile now, there's feeds Three and Four.
You can also do the ol' refresh every few second option at the KSC ELV Countdown Video site.
Also for the textphile among you, there's regular updates at SpaceFlightNow.