I am using ADW launcher with Home Switcher to toggle between the SE home screen launcher. ADW is great, it allows up to 7 screen and as you can see you can get much more on a page.
My main home screen is the centre one with Beautiful Widget on it for weather, time & date.
Handcent SMS & K-9 Mail are on the bottom tab on all screens.
The calendar app is Jorte and is synced with Google calendar on line.
The battery widget is BatteryLife.
If there are any other things that you want to know, just ask! Hope it inspires some of you to move away from the stock screens, which whilst good aren't as customisable as this.