It also gives easier tracking for Act progress as well as reveal the (embarrassing?) hours you've clocked up, and of course you can inspect the heroic deeds of your Battle.net chums.
Blizzard has blogged a little about the character profiles which are there to provide "easy sharing, comparing, and refining" of player heroes. There'll be adding more features.
"Yup, they’re ready," blogged Battle.net. You can view character profiles by logging in and then checking the "upper-right hand corner of your screen" of any Diablo III community site. "Make sure that you've selected your Diablo III BattleTag in the login box, and, once you've selected your BattleTag, choose 'view profile'."
Character profile highlights:
• View your heroes’ gear, stats, and skills.
How high have you raised your characters’ attributes? What are they wielding in each slot? What are their most prominent gear bonuses? What skills comprise their current build? Nuance awaits you in the Heroes tab.
•Track your game progress.
How many acts have you cleared? What bosses have you shredded in each difficulty? How far have you leveled up your hardcore and normal artisans? Find out in the Career tab. You can also check your play time (by class) throughout your entire Diablo III career, and learn how many monsters and elites you’ve slain.
•Share with your friends.
The Friends tab lets you check out your BattleTag friends’ characters, so that you can quickly compare notes on gear, skill & rune choices, and everything in between. You can also click on a BattleTag in the Diablo III forums to go directly to that player’s profile.
More development is planned: "We like that profiles provide for easy sharing, comparing, and refining of your heroes as you pursue monster-slaying mastery. In fact, we like profiles so much that we plan to add even more functionality to them as Diablo III evolves, including detailed statistics and tabs for achievements and artisans," added Blizzard.