hehe I LOL'd at that. Insanity is a minimalist rom. It's samsung photoshop rom (version 8.5) size is only 85MB+ only while his insanity CM7 rom is 40MB+
I remember you posted here before 
I am trying that. When I zoomed into my area and wanted to download the map, it zooms out and now I don;t know how large and which level it is downloading the map 

Wait, I think it downloaded the whole bangalore city!
If you are on gingerbread:
- Hold home button > App manager > click Running

Don't terminate any of them to clear memory. The app could l reopen by it selfs and may lead to battery drain. Just let the android OS manages its RAM on its own. When RAM is low, it will automatically properly closes background app to make way for a new app.

Sometimes, you will feel lag when you have many apps running at once. Try using autokiller (see front page) and set to "optimized" profile. Setting a very high profile will, OTOH makes app closes far too often and is annoying.

Not sure about essential background services but no need to know this one.