Erm.... I'm assuming your Evo (for some odd reason) is still on 2.1. In 2.2, however, both of mentioned applications have become a total hindrance to the Android platform, on a whole, because they don't work in 2.2.
I'm telling you people, and I mean ALL people, that this is NOT windows!! RAM is handled MUCH differently. Just because more is taken, does not mean that you should go around murdering applications to see the numbers go up. It's pointless, and with the advent of 2.2, the phone won't respond very kindly to you murdering applications, unless it's through the built-in task manager. It'll simply ignore what you did, let it seem like they're gone, waste some CPU cycles, burn some more of your oh-so-*hitched* about battery, then boot everything back up.
Believe me, if I can go a day (from about 9 to 10pm) on one battery, leaving everything on mind you, I think you can get a little more out of it, seeing as apparently more than 80% of the people here don't actually use their phones. I don't use a task manager... I have no issues. My phone runs faster than most people's, and guess what... I have yet to have any force closes from anything that I do.
I'm telling you, again, yes you, and you, and even you!! Android is not Windows. Let go of your previous mind-set when you grab your phone. It will only annoy you, and cause unnecessary hardship between you and your phone.
If you're running 2.1, 1.6, or 1.5, then yes, a task killer might be something I recommend, because in all reality, if it is running the old versions of android, it's more than likely not a super-star device.