I responded to you about AutoKiller in the other thread, but you might not have seen it. I have read the 'Details' write up (go to Autokiller, hit the menu key, click on 'settings', at the top of settings you will see Home page, click on that and at the bottom of the very first paragraph you'll see 'details', 'process manager' and 'FAQ') and can tell you that I understand Android 100 times better simply by reading that article. It's a bit long, but he does a great job of explaining the Android philosophy which is... keep apps running in the background at all times. This is the very foundation in which Android is built on, keeping your apps open so that when you close out of something it stays running in the background. Then when you come back to it, BAM, it's there at your finger tips, ready to use without having to wait for it to boot back up from scratch again.
So Android's management system assigns these apps a number that represents how important it is to you (this is all custom, the phone learns your habits, likes, dislikes, etc...), and when you start to run out of memory, it closes the apps that are least important to you. So by design an Android device is constantly using most of it's memory... that's by DESIGN... which means that going in a killing off all or most of the tasks to 'free up memory' is a huge waste of time because by design the phone is just going to go and use up all that memory again anyhow, that's how Android works. Which makes me realize why everyone has been telling us (yes, I used to use ATK's as well) that task killers go against Androids very nature. If you don't want your phone to keep apps running in the background, don't buy an Android device.
But what AutoKiller does is lets you set the buffer zone higher than it's set at normally. So where a stock Android phone doesn't start to kill unimportant apps until you reach something like 10 mb, you can change that figure to give your phone more free memory at all times (not just when you hit the kill switch in a task killing app... after doing which your phone started working on using up all that memory again anyhow). So take me for instance, I set my profile on 'Aggressive', which resets that value up around 90 mb's (there are actually 3 values, but I'm not exactly sure what each of them means)... so now my phone has a much larger buffer zone built into it so that it doesn't ever run out of memory. You can set that buffer zone as high as 250 mb's, but I honestly don't think you would see much difference between that and 100... unused memory is simply that, unused.
I checked my phone's free memory through Titanium Back-Up 3 times today and each time it was over 100 mb's...... Super sweet!!!!