Have you read up on task killers? Google made a blog post about it. They basically said task killers are unnecessary. Its not bad if you have "low" memory. Its not a windows pc, you don't want it empty because that just means it takes more cpu cycles to reboot that app/process, or it sucks more from your battery. There's like a dozen threads explaining how task killers are a giant misconception, search for something like "task killers good or bad" on this site.
As for how to speed up your phone while being unrooted, first...id like to recommend you root your phone. I was a little anxious to do it at first, because I didn't know if id brick my phone or any other unforeseen consequences. Turns out I was overly paranoid. Gaining root access, changes nothing on your phone. It gives you the ability to run a ton of apps that are currently unavailable to you, and they're definitely worth it. Off the top of my head, wireless tether for root users, shootme (screenshot/screen video app), and setcpu. I haven't bothered with roms, yet. if you want to root your phone, there is a 1 click method by downloading z4root. If you still don't want to root, that's fine its entirely up to you. Just know that you can't brick your phone simply by rooting it.
On your phone, are you using the stock launcher (motoblur) ? If so, id recommend either launcherpro first, and if you don't like that my second best recommendation would be go launcher. Launcherpro is a very smooth and polished launcher. Its what I use.
And ill throw in a few random app recommendations that I use daily. Zdbox, this app is like 4 apps in one. Its an app locker (locks individual apps, you can pick which ones), a battery icon (this battery icon is unique, it becomes more accurate the longer you use it, I haven't seen another battery app that can do this, also support is coming for 1% battery increments the developer told me), data tracker (it tracks overall data consumption AND individual app data consumption both sent and received I believe), and it has a task manager (that I don't use, it just tells you how many apps are running and available memory left). Systempanel, I really like the monitoring feature because it will tell me which apps are taking up a lot of resources and cpu time, which helps me weed out bad apps from my phone. Goto lock screen, this is something I've just tried out today, its a lockscreen replacement, extremely smooth and polished and very useful. It shows you your texts, missed calls, and email from the lockscreen, works very well. Also, if you have not tried out amazons cloud player, you should go set up an amazon account and upload your music to it. You can access your music through the amazon mp3 app, its very useful and convenient if you had or currently have all your music on your sd card, it frees up a lot of space.
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