Question... say I installed Cm7 but decided i want to go back to the Sense Rom, what do i do?
Assuming you have taken a Nandroid Backup of your Sense ROM, just restore it. If not, then you will have to install a Sense ROM.
Another Q I've got CM7, and have been restoring my apps, is there any way to automate teh installation of all the apps , rather then clicking install for each app?
Again assuming you are using Titanium Backup, when the program opens, press Menu Button > Batch. Here you will have an option "Restore Missing Apps" (Or something like that, in blue colour). Just use that, its a 1 click option to restore all apps.