Steam, and I love how the game looks. Huge amount of detail in the animations, and the sound design is fantastic as well.
And to everyone that wants new maps, I forgot where I heard this (maybe the bombcast?), but you don't see chess players complaining about the same 64 square board. The current map with the current set of heroes and items are open to limitless possibilities. To those looking for innovation in the "MOBA" space, give DotA 2 a shot and if you're not feeling it then jump back onto HoN or LoL no big deal, but I bet you'll find a lot of stuff you like about Dota / Dota 2.
Most definitely better. Patrick has taken a totally different route with news, posting the standard highlights while creating putting together some awesome features, and the new site layout is great. The addition of the subscriber features are amazing as well, HD video, HTML5, the happy hour, and so on. Can't wait to see what they have planned for this year.
Yup, plenty of games now are using sounds from more common libraries, but just as many games if not more are using custom sound effects from scratch. Sound design can really help to set any piece of entertainment apart from the rest, but to the OPs post, yes, many games share SFX.