Lost credibility for me at the first listed app, Advanced Task Killer. Task killers are not needed. I know this topic has been debated into the ground. I don't use one and my droid works just fine.
No, they're not needed BUT they save battery life and are useful to that effect.
Sorry. Not so. An app sitting in memory but not using cpu cycles uses no power, whatsoever. An app sitting in memory that occasionally wakes up to do a task, such as synching, uses less power than is required to initiate it for that purpose when it is needed.
Virtually the only valid purpose for a task killer is to kill a running process (i.e. using cpu cycles) that cannot be shut down. I've found this to be the case occasionally for music apps and for internet streaming apps. Otherwise, I've never encountered one.