There's a very interesting discussion going on over at enworld regarding the differences in combat styles between 1E and 4E.
None of the information is effectively new. However, the author of the original post does an outstanding job of explicating the situation.
Basically he breaks combat into two forms: combat-as-war (1E) and combat-as-sport (4E). The former requires the PCs to do everything in their favour to ensure an unfair fight (right on!), whereas the later emphasizes balance and teamwork (I'm paraphrazing on both counts).
Anyway, be sure to give it a good read.
Happy Super Sunday!