Depends what you want to know Cathryn
Cycling News is very good as well as getting the major stories they have features on riders and races, tech stories. Its the first port of call for many each morning.
If you want info about a specific team all the teams have a site
Garmin Chipotle is pretty good blogs newsletter they actually sign up to twitter so you could follow them on twitter during the Tour and the Giro.
Sure the others will be along shortly with others.