The only one I use out of the 5 is lookout, and lik others are saying I dont really notice a lag OR a use for it. It always says everything is ok, I expected it to go crazy when I rooted my D1, but it still says everyhthing i ok. I might uninstall it an see what happens, but I dont see a reason to keep or get rid.
Swype, like BacknBlack said, i type pretty fast with the D1, so I dont see a reason to have it. And also like others are saying I agree its not really an app.
Dropbox, I just downloaded but might uninstall and try the sugarsync. Seems like KZIWarrior knows what he is talking about. And never using it before, ill give it a try.
AppBrain, again I dont use, but I did download it and ill give it a try and see.
Gentle alarm, I don't use my phone as an alarm to much, so I don't see paying for ANOTHER alarm clock.
just my .02 cents dancedroid