I like the idea of Captain America going back to WWII. New adventures, new bad guys, new good guys...how does it affect the past, present and future of the MU. Then Cap comes back just in time for the 'Captain America' movie release in '08 or '09.
As far as Spider-man being back in HS, i don't know, I guess it could work.
anything is better than what they are giving us now.
I like the idea of Cap coming back in WW II times---he's even getting a WW II action figure in July--but what's the point, really, when we want him back in the present MU?
WW II CA stories might be interesting as a novelty, but they could have created an elseworlds-style series for that, and left Steve alive.
The bottom line is that eventually we're all going to want to see him back in the present MU Proper, and active.